My old posideon odin had both connectors built into the first stage. Great idea. Wish more companies would do it. That said, most of dive operations I've seen in So. Cal.and the Carribean use yolk valves on their tanks, so if I had to choose one, I'd go yoke. Back in the day, when I had regulr access to HP steel tanks, the posideon came in real handythough.
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<DIV>Overall, I've never reallynoticed a difference in terms of them leaking. I definately have had more blown O-rings with the yolk valves, butit's rare that onewould start leakingunderwater. </DIV>