I bought this for my parents to use in their hot tub. The light show wasn't anything close to how it is depicted in the ad. It was still fun. Some of the various settings cycle quickly through the different colors like a strobe light. It gave all of us headaches within seconds. The part of the device that is floating out of the water is transparent. This distracts you from the underwater light show. It is this feature that makes the strobe light setting unbearable. The light coming from the top is blinding.
Now for the positive: If this is being used in a hot tub, the light provided from the AquaGlow is more muted than the light installed in the hot tub. It makes for a more relaxing environment. Again, don't expect the underwater show to look anything like the picture but with that in mind, I'd say it is worth it. My family puts it on every time we go in.