The only negative (but significant) is the small range of settings. 0, 1, 2, and 3 millimeters. There is no scale for longer lengths, although the description says 3, 6, 9mm unfortunately.
Otherwise, it works perfectly and flawlessly

Perfect! Finally! And even if it cost 80€, it's worth it. Very powerful in cutting. If you want to shave your head, it's ideal. Quick head shaving without any issues. I randomly came across a review on YouTube where a professional was using it. Works great for trimming and beards. After buying 5 different and more expensive machines, I found a gem. Buy it without fear, this tool is amazing and it's free!