Someone should have their head checked. Waterproof to 5m, but gets it's buttons pushes somewhere below 4m.... Fail.
I am grateful for Doug's excellent work, and try to learn from him and the other great minds of this forum. But to me, this test is not an indication that the SPOT is not good enough. In fact, based on Doug's experiences I am actually tempted to buy one.... I am a bit concerned about his report of bizarre behavior, but the fact that the buttons may or may not be pressed below meter depth does not worry me at all.
Let me explain: It is feasible (but not likely) that I'd accidentally drop gear like this into deep water - based on hard earned experience I try to be very careful not dropping things when the consequences is immediate loss of vital equipment. Dropping on a pavement, on a track and in a poodle is a lot more likely. Being waterproof also means I don't have to worry about rain, spray or poodles. Waterproof to 5 meters means I have a lot more confidence when I expose sensitive electronics to my "definitely needs to be splash proof" environment.
What are the chances of dropping the SPOT into 5 meters of water AND FINDING IT AFTER A FEW HOURS? The only place that could ever happen would be unloading gear from a boat onto the pier. All other places the spot would be lost forever.
I am actually rather amazed that the unit managed to send a message while inside a tube of water. I am pretty sure it would not be able to send at the bottom of a 5 meter deep lake - water is not a good medium for radio transmission.
Now there are other factors that I don't like as much about spot - thank you Doug for pointing them out for me. But water proof is no longer one of them.