Got a Bakflip MX4 from Rick at freedommotorsports on here. Great price, fast shipping.
Fitment on the Bakflip was kinda meh. I expected better from a 700'ish dollar piece of equipment. Slotted metal bracket didn't line up with the screw hole AT ALL, had to do some grinding of the bracket to enlarge it. Shifting the rail around caused the cover to not close. It's resolved, but annoying.
Have not water tested it yet, but I think I'll be putting additional weatherstripping on top of the cover at the front and rear.
I also opted for the bedrug mat and tailgate piece. Bungies/tie downs are always in the truck, so stuff sliding around isn't a concern. Some sort of flat box/tray back there would be nice. The BakBox seemed really cheap and small with a hefty price tag.