Edited for clairity:
MY Dlask receiver is 100% Remington, yes, I paid probably 3 times more than for a grizzly. I only own the Remington, so I'll only comment on that:
It cycles perfect every time, I've shot all kinds of ammo through it, bird shot, heavy buck, slugs, Hornady, federal, cheap as it gets Can Tire stuff, its never failed. My only complaint is the side strap sometimes gets in the way of cycling, I've seen guys cut them off, but people always comment its there for a reason, perhaps legal, perhaps not. I didn't buy the Griz because I feel confident shooting magnum shells out of the dlask because it says its made for it on the side. I've owned a lot of stuff that was made in China that wasn't up to the same task of the product it copies, however, none of those products are firearms, just MY belief you get what you pay for most of the time. There are of course exceptions to every rule, I hear the Norc M14's are actually better than the springfields, go figure.