After researching and purchasing the machine two years ago, I have to say the following:
1. It is incredible how high quality it is even with demanding use; after shaving my head, it has never clogged even once... very powerful even with one pass...
2. The plastic parts have not worn out in the slightest.
3. The battery is a war dog; I forget to charge it, and even at 10%, it's enough for use...
4. I haven't used it underwater; I avoid that, cleaning it instead.
5. I clean it with an old toothbrush very well, and then I go over it with a gently damp cloth, and finally, I put two drops of oil on the blades...
I should mention that I use it exclusively for head shaving with many passes... if I can find something, but it's not negative, it's that I would like a guard that's even closer so that it almost shaves... however, it does absolutely what it was designed for, and it is value for money...