Technically, it's the Fastback and not the Razorback. The Razorback stuck up above the roof line while the Fastback is even with the roof. The Razorback also looks like it's attached directly to the back of the cab while the fastback has a definite bodyline gap between it and the cab. I don't like the looks of the razorback either, but do like the fastback. It's a personal thing, I guess. I think it helps the lines flow a bit better.
I also have a nice fiberglass full topper for it for winter, but it's still black from when it was mounted on the truck prior to the crash. I'm not going to bother messing with it until fall and then I'll probably sand it down and repaint it to match the rest of the truck. Then my daughter can haul around things in the back without them getting wet or snowy. Come spring, I'm sure the topper will come back off and the fastback will go back on since it looks sportier.