Have the Bak industries Bakflip on my 13' DCLB 4x4. Had the Rollbak on my last truck. Both not cheap at $800ish. Was very happy with the rollbaks durability/function, but had two major flaws - leaking at seal against tailgate and lost bed space at cab. The bakflip has its shortcomings too with less durable feel and lost visibility when fully opened, but it seals well, looks fantastic, and is easy to use. Both options eliminate the use of the tie down rail system. Good luck!