The Hollis 212 seemed to try and force air into my mouth. At depth I had to actually put my tongue against the mouthpiece to try and block the flow of air. No such issues with the Deep 6.
Chris is out diving his regs and fine tuning them.
He has been down the road-done it before-knows what it takes.
Expect the Deep 6 products to continue to get even better, based on direct diver feedback.