I've had mine since last fall, and it has been fantastic! We do a lot of camping, and it is great to have an enclosed bed to carry all the stuff we bring along. I got the tool box option on one side, and that makes for a really convenient place for my tools and set up supplies!
Assembly is a bit tricky - like an IKEA kit, but with sketchy instructions. I was able to assemble and mount by myself (with a tractor to lift onto the bed) in about 4 hours.