At first, when I bought it, it was very good, but after a few uses, its power started to decrease. (But still, it did its job just fine, although it would get stuck a bit if I tried to shave quickly or with long beards). It is very easy to remove and replace the heads. It does not cut without a head. It does not have a battery indicator, so you don't know if it is charged because the light does not turn off, it stays on constantly while it is plugged in. Obviously, it is not suitable for trimming as it constantly gets clogged.
I only had it for my beard and I was quite satisfied, although it didn't fully catch them. After about 8 months, it stopped working.

I got it for my father who doesn't have much hair. He uses it once a month without the attachment and it works great

I bought it for my body since it is affordable. It doesn't work for the body because it "cuts". It shaves very deeply, to the point where I dare say it is the same as my barber's. I haven't tried it on hair or cleaned it yet, so I will come back once I do

For the 12 euros that I bought it, it does its job and more. I haven't checked whether it is actually waterproof or not, but even if it's not, it's not a big deal.
Edit: It is indeed quite waterproof, you can easily rinse it after shaving and it cleans very easily.

I use it for haircut and beard trimming. It was satisfactory in everything until I opened it to clean it. It never worked again like before. However, it still does its job, just not as well as before. I would definitely buy it again