I installed the newer X4. I personally don't like the flips when they're open blocking the window, and roll up canisters take up too much bed space. I wanted to keep what little bed length we have for bikes. I like the matte finish of the X4 more than the X2 semi shine. It looks great, makes no noise and I can stand on it with no issues (200+lbs). The only issues I had was installing it. BAK phone tech was no help at all, even after I sent them pictures clearly showing the issues I was having with the locks not engaging. I had to shim it up, seemed to be more than the norm to me. Given, no two trucks are the same, maybe my bed is wonky and out of square. Measurement diff from front to rear width is almost 3/4", so about 3/8 shims on each side. Now it fits perfect. Shim problem...you have to get the shim kit from BAK (free) sent in the mail, which took about a week. Only plus for me was price, $870 free ship, no tax from tonneaucovered.com. Had to haggle with them but got them down to that price.