To start with, I haven't had much good luck with covers. I had the crappy Pace-Edwards Jackrabbit Cover that should be advertised as having the ability to make sure that your tailgate won't shut correctly and to turn your bed into a pool. Two words, absolute garbage! Detailer was an @ss and wouldn't exchange. Was in 3 times because of problems and visits corrected nothing.
I then tried a Nissan brand soft tonneau cover. I believe the cover was defective in numerous ways. All of the aluminum rails were warped with pretty bad bowing. Since the cover came with no adhesive, water poured under the warped up bowed frame rails. Also, the cover uses Zippers. One end of the zipper stays on the frame rail while the other side of the zipper stays on the cover. Both sections of the zipper are sewn on. On the rail, the zipper is sewn on to a rubber piece that slides into the rail. Watch out if the rear tailgate section is off, as these rubber pieces will slide right out of their channel onto the open road

. On the cover, the zipper is stitched to the vinyl cover. While trying to get the two zipper sides together (they're extremely tight), the cover stitching pulled out and ripped a nice hole into the cover. This was after only 3 uses of rolling the cover up. Nissan was great and gave me a full refund on the labor and cover.
So I'm now looking at a cover, the Access Roll Up Cover and am pretty impressed with it. The only spot where water looked light it could come in is where the side rails are clamped to the bedrail's inner lip. Since the cover's rail wouldn't overlay this seam between the bed rail's lip and the cover's frame rail, I thought water could work into the bed here. After speaking to an Access rep., she stated there is an adhesive tape to seal out water leakage there. I was impressed how quickly she answered and how easily she answered "ALL" of my questions. The nice thing is this cover was designed for winter weather and has no shrinkage according to access. It looks like a great cover.
What I would like to know from owners of this cover, is do you have any complaints? My main concern is water leakage, I want NONE. Hows the quality? Access pointed out their cover is made of the best materials to keep it from every cracking. It does have a lifetime warranty which made me a little more secure in a purchase. Unfortunately, I don't have a lot of options in buying one around here. A good dealer recommended by my Nissan Dealership wants $469 for the cover installed. While not a great price, Access says it's a decent price.
So is the Access Roll Up cover the way to go??
I was also considering Sport Masters Low Profile Roll Up Tonneau cover. It just didn't seem as well built and their customer service sucks. They were closed already at 4:30 pm Chicago time, and aren't even open on the weekends.

Also, many dealers around here don't carry Tonneau Master (Sport Masters) covers, but can special order them for a fee.
Thanks for the heads up, I really don't need another mistake sitting on my truck.
THANKS!