wondering about the tri-fold vs. roll-up who has them and why do u like it looking at the genisis now but there r alot out there and it is hard to make a decision on the style.
I've got the Lund Genesis Roll-up cover on my Ram and I love it. It looks good, it was real easy to install and it's tough. I've had it about a year and so far it's handled all the weather and wear/tear I can throw at it. My favorite thing about it is how quickly you can remove it and then put it back on. It's really easy, but very secure and water proof. I'd highly recommend it.
I bought a used (in great shape) "undercover" brand tonneau for my Tundra for $100. Retails for $695. Check craigslist.
I had the tuxedo roll up tonneau cover on my last dodge and loved it. When I bought the dodge that I have now it came with one of the roll up covers with the box at the front and didn't like it at all. for me, I dirt bike and use my box lots so I wanted a cover that wouldn't take up any room on my box when rolled up and one that didn't have the rails on the inside of the box. The tuxedo did all this as it was a soft cover that just rolled up into a ball type thing at the end of the box. This was out of the way of my bike and the rails went on the top of my box rails and didn't get in the way of any of my tie down spots. The other roll up one I had had a big metal box at the front of the box and took away almost 6" in my box which sucks for a short box. Also the rails were inside the box rails so it was easier to wreck the rails and they could have gotten in the way of my tie downs. I never found out as i removed it instantly. The one I liked was around 350 new, where the one I didn't like was like 700 new. The only advantages to the one I didn't like was that it rolled up on it's own and had it's own locking device. But for me that wasn't worth the hasstle that the cover gave me.
I had one on my truck of few years ago. It was the roll up (which I liked) and rail system. The only thing I didn't like about it was trying to snap it back down in cold weather. It shrank in cold weather and made it a real pain in the butt to get it snapped back down.
I've got a truxedo on my truck. Its a small box so I got the one w/ the rails on top of the bed rails to maximize space. I've had it for 5 years now and love it. The velcro sides are great and hold tight. No worries about taking on and off no matter what the temp. My old one had the snaps and was a total pain in the winter.