The shoe was my first love and forever!! It was probably the most popular among average runners between 2023-24.. personally, it was the first one that excited me (long live the nylon plate) and I broke all my records with it (10k in 42'56" and half in 1'37 in 2024)... before that, I had run 2 marathons with the Novablast 3, but with mediocre preparations.. I bought my first pair (lime color) in December '23, size 46.5, although probably 46 would have been fine too, and I literally wore it out (1000 km). I was still a beginner and hadn't researched shoes much, so I had 1 pair for all my workouts (a mistake, but as I said, beginner).. Intervals, tempo, easy runs, LRs.. obviously the shoe held up but somewhere around 4 months it started to get too soft, while there was some wear on the sole from the 2nd month. I had already done about 500km and with the Alexander the Great Marathon of 2024 approaching, I went shopping for a race shoe, since I had the impression that you need to change shoes at 500km.. whatever I tried I didn't like because I had gotten used to (and spoiled by) the very soft ride of the speed.. 3 weeks before the race, I bought the same one again in red.. my goal was to break 3.5 hours and I succeeded and was very happy!! But the 2nd pair didn't last as many km!! Somewhere around 400, it felt vague and not so responsive, especially in tempo and fast segments!! As if it wasn't fun anymore!! Coaches, runners, and store managers I spoke to told me that my stride and my training had changed and of course that I should have different sole/foam hardness in my rotation.
My first pair I now used only for recovery, while the red one for everything else.. eventually, after some irritation in the iliotibial band after a half marathon in October '24, I now had the Bostons as my race shoes, but the speed as my main daily trainer, I think it happened because of:
- lack of systematic strengthening and
- maybe because of the Saucony and their soft foam!!
Anyway, the model remains amazing, especially for runners up to 3.5 hour marathon. Below that, maybe something harder/more responsive or carbon plated is needed, depending on each person's stride of course!! I think the speed 3 was the most worn non-carbon shoe in marathon races and not without reason!!

Following the shoe as the next model from the Speed 2, and how satisfied I was with it, I decided to get it to be sure. I will run it in the AMA, just like I did last year with the Speed 2. It is a different shoe from the previous one. It is wider at the bottom, resulting in it being considered more stable, but losing the feeling of your foot leaving the ground. I was used to a different shoe, of course, and I had no problem with it. It seems a bit more snug than the previous one, without being bothersome (maybe at first until you get used to it). To tell you the truth, I believe that no one should spend so much money in this industry that is built on athletes by companies that release new shoes every year for €150 and we think we have to rush to get them. With the pace I run, 5:00 - 5:30, the shoe is great. If I could get the previous one again, I would, if it had a similar price. I ran 30 kilometers in Ioannina and half marathons on asphalt, and they are very comfortable and cushioned even in the last kilometers. Definitely very good quality, but they could be more affordable.

Owner of the Endorphin 2, with which I had run about 500km, I decided to replace them and move on to the next model.
My goal was training and races - training at around 4:10-5:00/km, depending on the type of training, with the goal of mainly 10km races, maybe even a half marathon.

Having run over 100km with the new ones, I can express a safe opinion about my impressions so far.

It is a good shoe, very lightweight, and it really gives you a boost, especially if you run at 4:40 and below... The more you push, essentially, the more it gives. I am not a professional, I am just reporting what I observe.

However, I feel that the Saucony Endorphin 2 were much better, as they had a similar boost and a narrower fit, which suited me better and fit my foot perfectly. These specific ones bother me a lot in terms of lacing and overall fit, so that my foot doesn't "wobble", even though the size is correct for my foot. Additionally, the laces are somewhat strange and when tightened enough, they cut into my foot - essentially, I have to tighten them enough to avoid the aforementioned problem.

In short, I don't feel them well secured on my foot most of the time and I often notice a fatigue that I didn't experience with the old shoe.

I would recommend to anyone who wants to buy them to try them on thoroughly, to see if they fit them. Maybe they didn't fit me due to the shape - I repeat, the 2s have a narrower fit, which was ideal for me...

Welllll... I am writing this comment because, being difficult in my purchases, I always look and always rely on good and detailed descriptions and reviews. I am an amateur runner with the goal of participating in a marathon for the first time, aiming to complete the race in about 3 hours and 45 minutes. Having only used Asics Kayano (25) & Nimbus (21) in the past, and after a few years of hiatus from running, I decided to get the Speed 3... IT'S THE BEST I'VE EVER PUT ON IN TERMS OF COMFORT, as far as the interior and how it hugs the foot. I will only focus on this because others explain the rest in their comments... They had given me the Kayano as the ideal shoes for overpronation, which I have to a small degree, but they don't even come close to the comfort I felt with these shoes. The truth is, I also have the top Nike shoes, the Alphafly Next 2, and I have also tried and run on a treadmill with the Saucony Endorphin Pro 3 and the Nike Fly 5... I have a lot to say about each one, and surely some may have better cushioning and shock-absorbing properties than the Speed, some may be lighter, faster, or more propulsive than the Speed, but like no other shoe, I have never run so many kilometers with such frequency every day and not get a single blister or injury or feel any discomfort. Maybe they fit my foot so well, or maybe they are just that comfortable in general. As for the other characteristics of the shoe, they are all more than satisfactory, and I believe they will be enough for every amateur runner, and possibly for many professionals as well.

Having worn out the saucony triumph iso 4 (1240 km) and 5 (1350 km), having extensively tried the endorphin speed 1 and currently using the ride 15, speed 3, and pro 2, it's time for an evaluation:
The shoes are excellent! The foot goes in and feels comfortable, the heel "locks" in the right position, and the shoe hugs the foot exactly as it should.
Breathability: impeccable, whether it's summer or winter, the foot stays dry and well-ventilated.
Feel: as I mentioned earlier, the foot locks in place and stays there, giving you the sense of security you want (which was missing in the previous 2 models) to break your personal records. Additionally, the forward propulsion technology sends you smoothly forward, reducing the effort and fatigue of the foot. I say smoothly because the pro 2 pushes you forward even forcefully, as if you robbed a casino. Furthermore, there is no annoying inward tilt like the speed 1, at least.
Lacing: they nailed it! They achieved the perfect lacing! The laces are not "slippery," they are elastic enough (so that if you tighten them too much, they have some give) and velvety/soft. This way, they do not create pressure points on the foot.
Tongue: perfect? Excellent? Just the right length, so that it doesn't come out of place but at the same time protects the foot from the laces. This way, you don't need to tuck the laces inside the shoe if you're curious like me.
Performance: it is for paces of 4:55 and below. The faster, the better, they show what they can do.
Size: the toe box is narrow, so go half to a full size larger, not your regular size. I wear a regular size 45, returned it because they don't make 45.5 (half size), and got a 46 (one size larger). It's perfect.
An explanation: because I noticed some ambiguity in the sizes of athletic shoes in various reviews, especially in racing shoes, as well as in their use, therefore the result, therefore the evaluation, I want to clarify something to maybe help people understand. Each shoe is made for a specific weight category, for a specific pace category, and for specific distances. You don't just go and buy whatever. Because the speed 3 is a great shoe, it doesn't mean it's suitable for someone who weighs 80 kg or more, even if they are all muscles. And no, it's not related to height. For example, the speed 3 is for those under 70 kg, mainly for paces below 4, but it also supports 4-5 (5 being the limit) and is suitable for medium and long distances. Obviously, I also use them for interval training. There are other shoes for a fast 5K, others for long runs, and others if you want an advantage in a race. The speed shoes do it all and are cost-effective. Nevertheless, for longer runs, I, for example, also got the ride 15, so that they accumulate mileage instead of the speed shoes and thus last longer. Saucony is not fooling you, nor are their sizes fake. For all shoes, go with your regular size. For the endorphin speed and pro, go half to one size larger.
In summary: the shoes are a combination of the performance of the speed 2 and the comfort of the triumph iso 5. If you haven't tried either of the two shoes, it's like having a Nissan Skyline (speed 2) with 850 horsepower and putting a Ferrari Enzo interior (triumph iso 5) inside.
Update 7/30/23: a 180° change of opinion... Now that I have covered 710 km with them at paces ranging from 4:15 to 3:20, my opinion is negative. From 350-400 km onwards, the energy return was not the same. To reach the same pace, I struggle as if I'm running beyond my capabilities. The slightly larger size than usual now burdens me, whether in interval training or long runs. Now my ankles hurt and I have a constant tendency to cramp in my calves, something I haven't had in 10 years, even when running with €30 cigarette paper shoes. To achieve the proper fit, I have to spend 10 minutes dealing with the laces before I start running. Because I almost simultaneously bought the speed 2, the difference between them is obvious. The speed 2 are guns! While these ones are left with the reputation. I wear the speed 2 and simply run. And I run and run. Ultimately, 3 stars, no more.

Very good shoe.
I had read many foreign reviews before deciding to buy it.
I will mention the positives and the few negatives.
Positives:
1. It gives you real propulsion when you run. On flat roads, you feel like you're running downhill.
2. Nice fit (at least on my foot)
3. Very soft but without the vagueness that very soft shoes have.
4. It seems quite sturdy - zero wear after 95 km that I have done so far.
5. The outer rubber sole is somewhat hard and gives you a good sense of the road.
Negatives:
1. Relatively unstable compared to some shoes from German companies (e.g., Adizero Adios 6), but ABSOLUTELY manageable
2. The tongue is relatively short and the laces have a woolly feel that makes untying difficult
3. For me, weighing 82-84 kg, they give me the feeling that after 4-5 km of running, the soft sole is finished and I feel the impacts for the next kilometers. A friend who has the same shoes and weighs <70 kg hasn't noticed anything like that.
4. In terms of grip, they are just decent (there are better ones)

Overall, their disadvantages are minor and absolutely manageable, while their advantages are huge.
I would buy them again!

Update 200 km.
After 200 km, the shoes are almost new, with the outer sole intact!
They really help you go fast. In interval training, especially, that I do over a total of 5 km, with three 400s on a slight downhill, and six 200s uphill, they help me a lot. Unfortunately, as happens with all fast shoes, due to the relative instability, they cause some minor injuries. With these Saucony, the most common is strains in the arch area at speeds of 4:30 - 4:40, which pass quickly. With good quality socks (e.g., Danish Endurance long run), the problem decreases. At least they don't strain the knees.

Update 343 km:
Unfortunately, while all their positives hold, at 340+ km they start to have durability issues:
While the sole remains impeccable, the right shoe starts to wear through at the big toe.
Moreover, and worse, on the left shoe, some hard plastic has come loose at the inner front section (above the toes) which I feel intensely during training.
After running 9+ km, the toes in that area are quite red despite wearing relatively thick socks.
Really a shame...