I've tried these and they are okay in a couple feet of water. Get down 10 feet and the film is too fast for the light levels. The pictures come out very grainy. Plus, it is very hard to look through the viewfinder with a mask on.
Not to mention, you don't know what you've got until you develop the film. A lot of times there is silt in the water that you can't see when you look through the camera. When the flash goes off, it illuminates. What looked like a good pictures winds up being crap and you don't know it until you develop the film.
I switched from a Sea & Sea Motormarine II film camera to the Nikon DSLR with housing because of this. I would shoot 10 rolls of 35mm film and get a handful of good pictures.