I ran an OG f1 frame for a bit. Good was the "batwing" configuration was about the best setup I've had to date. Really slick and easy way to organize your stuff.
But that was about it for good. Bad was it had no functional load lifters. Had to DIY my own. The load shelf was waaaaay too low, so it was useless. The hip belt was meh - I found when I hauled out elk quarters it bruised the heck out of me and wouldn't stay cinched.
I guess they're offering an f1 2.0 here soon, with all of this fixed. I hope so, cause they had the right idea with the first one, but it missed the mark as far as being a "meat hauling" pack.