Mine works really well...
I have fibromyalgia and I don't want strong jets, they hurt.  This is perfect.  The first time I used it I moved it all over the tub.  Because of the design you can put it anywhere except directly behind you, and I did that too, you just can't lean back, but it did feel good on my sore back.  The suction cups hold really well, in fact, if you can't move it, slide your fingernail between the suction cup and the tub wall, that works.  I really like it.  In fact, I've just ordered another, in case this one dies from overwork.
Rating: 5 stars