I put the Bak revolver on mine. It's awesome. I can use the whole bed and can still see out the back window when it is fully open. The best part is that it's totally secure and you can close the tailgate when it's fully closed. Not many covers let you operate the tailgate without lifting the cover. I will admit, however, that pulling that tiny key out of the fob to lock and unlock the tailgate is a pain in the a$$. A tailgate that locks electronically with the fob is an upgrade that I would absolutely invest in if it were an option at the dealership.
I hate to say it, but a good tonneau cover is that accessory that is worth waiting one more paycheck to buy and invest in. Having something secure and durable is worth the price of admission in my book.