Got the bed cover installed last night. It's the RollBak model from Bak, same company that makes the BakFlip. Overall it seems to be well built and the install wasn't too bad, despite the horrible instructions. It's spring loaded so once you release the locks it will automatically retract into the canister. It comes with a few sets of adjustable stops that you can mount anywhere on the rails. One set is already installed and you just have to screw it to the rails, the others are shipped loose and I didn't install them. I have it set so I can open it about 18" but if you need to stop the cover in other increments it's fully adjustable. For me fully closed, slightly open and fully open will be fine.
I would have gone with the BakFlip G2 again, but I haul my 4 wheeler in the bed a lot and I didn't like losing my rear window with the cover up against the glass, especially when pulling the boat. You do lose about a 8-12"of bed space, but since this bed is 8" longer than the last one it will be fine for me. Also, you lose about 6" of bed space with the BakFlip when folded up against the glass, so not a huge difference. There's also some space below the canister that will be good for small toolboxes and a floor jack.
It looks to have about the same water tightness as the BakFlip (which was about 95%) with most of the water coming in around the tailgate gaps. For my needs, this cover suits me very well.