+ 2 on my "have to buy list" for a year already..
I was seriously thinking of getting one but the problem I see now is that you can't change what your dive time with be on a dive when you are out in the water. For instance I may start my day hunting the shallows and then go deep or I may start deep and go shallow. Completely different dive profiles and dive times. I wonder if they are addressing this issue?
Overall the thought is great and if it used right it will help to give that little edge of safety.