I changed 2...
The first one, exactly 2 months after the warranty expired, the RGB on some keys started acting up.

The second one I've had for 3 years and for the past six months it has started to have ghost typing from time to time.

goooood moooorning, hoooow aaare yooouuuu....

I would have ALREADY changed it but
1) I can't find one with 6+ macros - which I need
2) sometimes it works fine....

I see myself going for a
Corsair K100 RGB
Logitech G915 X Lightspeed
Razer BlackWidow V4 Pro

I've ONLY had positive impressions with Corsair, unlike Razer / Logitech.
But I think I'll give it one more chance.

Nothing that the guys below say is wrong, everything is happening to me too! I feel completely deceived by a company I followed faithfully and blindly for 16 whole years since I was 15... the only sure thing is never again Logitech keyboard... no comparison to the old school... they have received a red card from me after this... wasted 200 euros... keyboard two years old... and with extremely light and sparse use (60% office work and 40% gaming) not like before when I was really using my old one... at least if it had lasted two years without issues and then suddenly broke, okay, I could say it was worth something, at least I enjoyed it while it lasted... but this, guys, is the definition of cancer, it has been having issues since the first year, just not as bad and frequent, but the problem is that it kept getting worse, and now in the second year, it's unbearable. How I haven't broken it yet, I don't know; I am amazed at myself... next keyboard Corsair, no discussion...!!!

I will also write that I have exactly the same problem that everyone mentions in the comments. I came here from the g810 which had exactly the same issues. Visually, the most beautiful keyboards, but I can't keep spending 200 euros every 2 years... Also, I want to inform you that after many hours on the phone trying to get someone to repair it and searching in forums, the temporary and unorthodox solution that makes it feel like new is to hit the key that causes the issue, but not hard enough to break it. It gives it about a month of life and then it's the same again.

Very good keyboard, excellent in all aspects. The texture of the keys when using them, the way it embraces the finger when pressing each button, etc. But a €200 keyboard that after a year you press a key and it doesn't respond at all or gets pressed eight hundred times is too much.

After 3 years of use, half of the keys do not respond when pressed, and the other half register double or triple keystrokes. For example, when you type something, it outputs "ettttsi" and if you press backspace, it deletes the previous word with just one press from the 5 registers. Similarly, when you use ctrl+c ctrl+v, it performs endless copies. It's a nice keyboard, but useless. It has an expiration date.
It took 15 minutes to write this message

I put a star and it's not strict.

Visually excellent, nice feeling on the keys, etc. generally very good all around.

Basically,
The keyboard has an expiration date, completely random, it can happen to you either in 2 months of use
or in 2 years, and it's called double typing and it happens on random keys, and it ruins everything good...
(That is, you press space and it writes it twice.)
There is a huge thread on Reddit with people who have experienced it and there is no official statement.

So, only for this reason, it's a bad purchase, let alone at this price.

1.

After three years, problems with the keys started (double typing, unresponsiveness). I use it 50% for relaxed gaming and 50% for office work. I bought 12 replacement key switches from Amazon (OMRON) and replaced the problematic keys. In the next malfunction, it will go for recycling. It is the first time since 1996 that I replace a keyboard due to a malfunction. Simply unacceptable for a €200 keyboard. Unfortunately, the Romer-G switches turned out to be faulty, and this affects the newer models as well.

A mediocre and relatively old Logitech keyboard. Purchased in the year of its release and since then I have no complaints. The switches are a bit bad, but other than that, it's fine. I do not recommend it at this price as it is a 5+ year old keyboard. You can find a better one at a more reasonable price. 6.5/10

Bad purchase, problems with the keys out of warranty of course but apparently all the new Logitech series have issues with the responsiveness and multiple key registers after a while.

I am not satisfied with the keyboard either. While it is incredibly convenient, like all Logitech products, I encountered the same problems as the other reviewers. In the first week of using it, the F1 key almost broke, and the keycaps became crooked when I tried to reposition them. For the past week, I have also been experiencing double strokes on the "d" key (I've had it for about a year and a half). It's time to retire it, as I expected it to last much longer for the price.

Well, I've had the keyboard for a year and a half and the problem that has appeared is that I have to press many buttons and see if I'm actually pressing them! But some buttons are pressed twice or more. It has issues with 'i', 's', and many others. I tried to fix it by adjusting the screws, and the only thing I managed to do was to adjust the wires under the button covers to have better responsiveness, but still, I can't play games with it, so I use another keyboard. Until a week ago, everything was working perfectly! Suddenly, it broke, even though I took care of it and cleaned it! It's not worth 160 euros, and in general, if you get a Logitech keyboard, be careful if it has ROMER G keys. Those are the ones that caused the damage!

The review is written with the g910.
Well, for 200$ you have to hit the space for it to work, what a shame because I had high expectations for the product.

Edit: Now I'm typing with a different keyboard so the problem is over.
The product definitely does not justify the 200$ I spent, but it lasted for 5 years (let's say that).

I switched companies and went for Razer, much more disappointed than with g910.
Well, the g910 keyboard from 2015 competes equally with the latest flagship models from Razer, such as the black window elite that I now have, there are huge differences mainly in software and in the led, where Razer is simply unacceptable.

Finally, the build quality of the g910 is for keyboards that cost at most 30$

I mainly used it for FPS games and the Shift and Ctrl keys broke. It was still under warranty and they sent me a new one. After 1-2 years, the same buttons broke again and now some other buttons don't work properly (they get pressed twice).

Very bad purchase. The keys are pressed 2-3 times. Additionally, the w a s dd keys that are heavily used in games are completely broken. Even the D key is malfunctioning, and there is no 10 key at all. It's a shame for such a company. The text was written with this keyboard, so you can see the problem for yourselves

Although the keyboard is very good in terms of build quality, button feel, and lighting, I have had it for 2 years, clean it frequently, and it is like new. However, the issue that disappointed me is that some buttons started not responding with a single click or I have to press them once and they respond multiple times. For the price of 190 euros, which is not cheap, I expected it to last much longer. And no, the warranty does not cover it because it's been 2 years.

I have been using it for 1.5 years, it's excellent. The classic Logitech quality that one would expect, without any frills, gimmicks, and stories. The switches are quite silent, fully customizable layout, both in terms of lighting and macros. My only complaint is that the palm rest is too small/narrow, even if removed, the plastic "frame" underneath remains, preventing the use of a different palm rest.

Very good keyboard. Overall, I am very satisfied. However, I expected better quality materials at this price.

I have it for 1 month and so far it gets 5 stars. Although it does not include the larger Logitech palm rest in the package, which truthfully, at 180 euros, it should have had 2 more spare parts, it is one of the best keyboards I have used. Immediate response and I don't want to hear about cherry and stay away from patents and such. I believe that the romer will catch on in the market and stay. As noisy as it should be, as clicky as it should be.. BUT the keyboard and mouse are a personal choice for everyone, how it fits in their hand, etc. So try before you buy.

Distich without service in our Greece, such a company is unacceptable to not have after-sales as everyone claims, it has a problem and you can't turn to anyone if the warranty says repair, it's a shame because it was an awesome keyboard (as long as it lasted) :(

Very good keyboard!! Expected for 160 euros but I really didn't expect such a nice feeling on the keys. The previous one was the G710+ and unfortunately it was withdrawn due to an accident with a sprite. Difficult to clean compared to the previous one but the LEDs are amazing!!! You win some, you lose some!! The mute and volume control for the voice are one of the best for me.. Must definitely be the programmable keys. Surely there are cheaper ones that have all the above options, but if you have the money, you won't be disappointed!!

I have bought it a week ago and I am absolutely satisfied. Very sexy/professional appearance, good build quality and of course... mechanical keyboard with Logitech's Romer-G switches. They activate at 1.5mm, so they are very fast. And of course, RGB keyboard with Logitech's new software that offers many combinations of effects on the keyboard's LED lights. Recent addition is the editor that allows you to create your own effects for the keyboard's LEDs. A very good purchase if you can afford €210 or maybe even more. I highly recommend it!