Hey there - I have Apeks XTX 50 regulators. They are set up for doubles, so two first stages and two second stages, with deep DIN connectors. They are currently set up for the GUE configuration (one long hose, one shorter one set up to be worn as a backup around your neck). They also include a Halcyon SPG and a drysuit connector. I bought them new about three years ago, and have used one set on ~5 dives and the other set on ~15 dives. They were $1,400 new, and I'm asking $800 for them. Let me know if you're interested.