I bought my son and I an AQUA-VU as an early Christmas present. I was kind of skeptical about it's worth, but it is great.
My son spends more time with his face in the viewer than he does fishing. I didn't buy it as a fish finder, rather I felt that it would be a good way to increase his knoweledge of behavior. I couldn't be happier.
The other day we sounded some good arches on a main lake point in about 30 feet of water. An angler on a passing boat mentioned that he too had seen some good marks at that depth. We dropped the camera right into the middle of a small school of stripers. We had assumed they were largemouth. With the AQUA-VU you can find out the species of the arch. Later, he saw a bluegill swim by the camera. We were at Skinner, which is known for some good gills in the east end tules, but we saw him at the edge of a cove near deep water between launches 1 and 2. I had never imagined that a good gill spot in this lake.
The fish do not seem overly alarmed by the camera. we had a huge largemouth flair its gills at it once.
One thing that really sucks is seeing the crap on the bottom of our lakes. I never realized how much litter some fisherman throw into the water. A videotape of the bottom of a popular fishing spot would be great ammo for those looking to close waters.
Just my two cents on the AQUA-VU in case anybody is sitting on the fence.