Product is good, but my one tub not!
I tried this once and liked the quality.  However, my one tub has a completely straight back, so even with this cushion it wasn't real comfortable. I don't really fault the cushion for that.  The suction cups work well.  The material is rubberized so it does not absorb water.  I will try in my other tub, which has a slightly more inclined back, and then update this review.
Rating: 4 stars