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with the XTX it takes less than 2 minutes to swap over, so if you don't like it backwards, change it back. Or get a Xstream where you can do it in the water.As @JohnnyC mentioned, you want the second stage in a normal right-handed configuration. Put the hose behind your neck so it comes over your right shoulder as normal. Otherwise, you've got a mess of a hose sticking out in front of you trying to bring it straight from the left side.
I'm a big fan of the Poseidon Odin(jetstream) and own several. Problem in this context is that Poseidon does not offer them rated to 100% O2. Withought debating how you can (or can't) O2 clean the earlier Poseidon regs, facts are the OP asked about regs specifically rated for deco / O2.
That's why I recommended the Xstream/deco, which is supported by Poseidon for 100% O2 service. And FWIW, the 2nd stage is just a compact version of the jetstream. And the Xstream 1st stage is just an awesome design.
I have all mine O-2 cleaned so that's a non-issue. I don't have any X-Streams but people seem to like them, and im sure they'd be fine as well. What I like about the Odin second stage is its super easy to grab and stow in a bungee loop, it's got that +\- switch, and it's really hard to break. I'm also not a fan of hoses behind my neck in sidemount (my own preference) so they work great there. They are not on the cool kid radar and can be found crazy cheap. You can find 3 or 4 of them for what some of the others cost.
you're killing me Bill, stop telling people that!