Dangerous!
I'm sorry to give this only 3 stars because I thought the product was a great idea.  It sticks extremely well to the tub and I think the bristles scrub quite well with a lot of work.  The problem is, its made from hard plastic and there is not much clearence between the top of the shoe and your foot.  In the process of scrubbing, it is difficult not to take the skin right off your foot in that area.  You must be very very careful.  I ordered two but I'm going to have to send one back.
Rating: 3 stars