rescuediver009:I wouldn't touch the poseidon without test diving it first though.
Good advice. I have an apeks (well actually a zeagle) and a poseidon. Everything they say about the poseidon's horsepower at depth is true but I still prefer the apeks - it breathes a lot smoother and I don't notice it as much. I find the poseidon's continuous clanking makes me self conscious and my sac actually increases.
YMMV