Review (1/5): Wish this would work. :-(
I really wanted to like this but it is flat out useless. I charged it fully, then tried to use it on a few different brushes of mine. My brushes are fairly thick so I used the second from the biggest holder. I pushed it all the way in and made sure it fit snugly, but when I turned it on it was very wobbly. When I put the brush in the water, it would barely spin. I tried raising it up and down to see if there was a sweet spot but no matter what I did, it wouldn't spin enough to do anything. I had to clean my brushes the old fashion way.
The black part that goes on top of the bowl wouldn't fit on the rim and kept falling into the bowl, so I ended up taking it off all together.
Also, don't keep this charging in your bathroom overnight if you have an open bathroom. The bright blinking light will keep you up.