Review (3/5): It's quiet.  Not super powerful
I do like that the 3 different grit rollers can be flipped right on the head. It is quiet. I charged it several hours before using it, but it began lagging quickly. I plugged it in and kept using it and didn't notice much difference while plugged in. The description recommend only use 2 or 3 seconds at a time but I didn't find any reason why it would say that. It wasn't very powerful, but I did see a considerable amount of very fine skin. It didn't collect in the little tray that I could tell. It claims to work wet or dry. I will leave the wet testing to someone with less candles on their cake than I. My feet felt better after using.
I believe there are better ones than this at a competitive price point. It did work so I have to give it at least 3 ☆☆☆. It was quiet so that's a plus. The charge cord is very short.