I had one.
Put about 1k rounds through it.
I sold it.
Recoil impulse sucked. The tinging sound of metal on metal as the piston drove the BCG always made me cringe. Felt recoil was a lot more than any of my other DIs. Its piston system is markedly heavier than a Di. Made the rifle front heavy.
Changed my whole opinion of pistons systems, I am now a diehard Di-man.
One a side note, I called Stage a few time to resolve the issue of the recoil impulse, they were unhelpful. But when I had an issue with one of the MI buis and they took care the problem with no fuss. They sent me a replacement, and a prepaid envelop to send the old one back. Pretty damn sweet service.
Assumption is the mother of all ****ups.
Know what you know, Know what you don't know. -Paul Pedzolt
"Jack of all trades, master of none, though oftentimes better than master of one" -Mynshul