Terrible!
Product description states,"No Slip Cups that Stick to any surface!"  Yeah, sure--if you nail it to the shower floor!  This thing didn't stick at all, and constantly moved around--had to use the other foot to hold it down while trying to use it.  That worked.  The other issue is the top ring.  I have size 10 1/2 feet and when using this, combined with it moving around, caught my pinky toe on the edge of the ring and ripped my toenail off.  Not only have I returned it, but threatened legal action.  Stay away from this junk!
Rating: 1 stars