Well guys.....I bought the machine for hair cutting at 4 millimeters and beard grooming at different lengths. Starting with the quality, I have to say that the combs are as disappointing as most users describe them!! The plastic is of such poor quality that if it slips out of your hand, it's gone!! If you see the combs, you will understand what I'm talking about! I'm even afraid to press them during use! Now, regarding the use.......on the head and at 4 millimeters, it's simply disappointing because firstly, the head is quite large, so it loses a lot of curves and angles (my head is not perfectly round) and secondly, I don't know why, but I have to make multiple passes and it cuts well in some areas and not in others. Another major issue with the machine is the cutting guide (the edge of the comb) as it has a large distance from the blade, resulting in a lack of precision in the cut! You see one thing and cut another! So forget about precise trimming. In that case, I use my old machine because my new one is simply unacceptable!! The distance between the cutting guide and the comb is so big that I really wonder if they tested it before putting it into production!! I should note that my old machine is also from Philips (the model that collects the hairs inside) and the difference is overwhelmingly in favor of my old one, of course. If you are exclusively interested in beard trimming and rough work, go for it, it's good. If you are interested in detail and hair cutting, avoid it! Also, after a while, it gets clogged, so it needs frequent breaks for cleaning. Additionally, the handle is not ergonomic for gripping as it has an excessive tilt in the body of the machine. It will be more useful for someone to cut someone else's hair rather than cutting their own. These are the few things!! Personally, I didn't like it and I wouldn't buy it again. On the positive side, the battery seems good so far and charges quickly. As for the electric length adjustment on the combs, well...it's not really significant...more of an effect....
New update. July 2023. One of the combs broke for me too and I didn't even realize how!! It didn't fall down, it just came off while removing it from the machine.