Review (1/5): This thing is absolute garbage.
I don't like writing bad reviews, but I felt like this thing rates one. I really can't return it for a refund because it is what they said it is and it does what it says it does. It just does it really poorly. The different pads are a nice touch, but they're useless if the motor doesn't spin them effectively.
I put 4 brand new AA batteries in it, and got in the shower. I selected a pad, turned it on and it spins at probably 160 RPM - between 2 and 3 revolutions each second. Which isn't bad, except that it slows way down if you put the motor under a load (such as pressing it to your skin). It then bogs down so badly that I could easily cover the same area on my body with a 99¢ scrubbie and do a better job.
So this is going straight into a yard sale. Save your money and buy a scrubbie and a back brush - at least they don't eat batteries.