For the past 15 years or so, I have worn a Seaquest Diva, but for giggles I just bought a Halcyon Infinity with SS backplate; have yet to try it. I use an Oceanic Delta 4 reg. I like the way it flexes/swivels by the second stage; I put a small comfo-bite mouthpiece onto it as I find all commercial mouthpieces too big.