Following the very good comments and reviews about this specific machine, I took the step to purchase it.

As a background: I use a hair clipper on a weekly basis (1 to 2 times a week) for both my head and face, and for years I have been using machines that cost around 50-70 euros, mainly from Philips. Wanting to upgrade my machine, the KEMEI machines caught my attention due to their very low price combined with good reviews/ratings.

I have used it twice so far and the truth is that the machine does indeed cut well (not as well as I would expect, of course, in terms of smoothness, but since I never let my hair grow too long, it wouldn't allow any machine to get clogged). The big problem is that it causes serious irritation on the scalp as well as on the neck and generally on the lower part of the face. I haven't seen any marks on my head, but in the two areas I mentioned before, it feels like they have been rubbed with sandpaper.
I applied some oil to it to try it for the third time, but if it still causes irritation, it will go in the basket of useless items.

As for the construction, it is generally okay, and because it is "naked," it is relatively easy to clean.

Definitely value for money, and of course, it also depends on the user and the purpose it is used for, but not for 4 and 5 stars. It is for 2-3 stars max!