Review (1/5): Good idea, horrible design
This product would be great were it not for several design flaws. This will only stick to a completely flat smooth shower floor or surface. So if you have any kind of raised texture or tile shower floor, forget it. Next, when you do have a smooth place, it will not stay put, it slides when you try to move your foot in and out, even though the suction cups are holding to the floor. Also, the bristles need to be more rigid. Put the most painful thing is that the part that goes over the top of the foot is not padded in any way and will irritate the top of your foot after several uses. And the pumice stone in mine broke almost as soon as I started using it.
The makers of this product have a good idea but need to go back to the drawing board for the reasons above. If they improve it I may try it again later, but I doubt they will re-do it.