Good for some tubs, not so good for others
I have a walk-in tub which has less surface area than a regular bathtub, and, the walk-in tub is about twice as deep as a regular tub. This unit does not have enough power to whirlpool the water in such a deep tub. Also, the small button on the top of the unit to change the type of flow is very difficult to turn when your hands are wet, which is most likely to be. The suction cups do not hold the unit to the side of the tub substantially so I had to tie it to keep it from falling into the tub. I returned the unit because of these things. I am not condemning the unit, it just wasn't for my liking.
Rating: 3 stars