I just installed the Revolver X2 last week, so other than an initial fit and finish, I don't really have much in the way of a review, but I do have some pics.
BAK Revolver X2, met all the requirements I was looking for, I wanted something the was more secure than a soft tonneau, but easier to get out of the way than a hard cover and I didn't want to give up the bed space for something like a roll-n-lock, also I wanted it to sit flush and not stick up over the bed. I had considered a tri-fold cover like the undercover flex, but didn't like how it blocked the whole back window when open.