I've hit up GS 15 or 20 times and only once did I find anything. It was a decent score though, I found:
2 GS brand 360 controllers
3 Modern Warfare 2 360 controllers
1 Wii wired network adapter
2 GS brand PS2 racing wheels
1 PS3 Move controller (the one without the ball thingy)
1 PS3 BluRay remote
1 360 power supply
probably a couple other things I'm forgetting
All the controllers' cords were cut but that is an easy fix when the cut is close to the controller.
I fixed a few things, sold a few things and threw a couple away that I had no use for and wasn't selling.
I don't go diving often but when I do, I'll continue to check GS since it's on my 'route' and it's one of few places left that doesn't have a compactor.