It seemed like everything I wanted to carry would just not quite fit under the cover. Additionally, on the early ones, it was a PIA trying to keep the back truck window clean. On my last cap (however) I was able to get a fold down rear window. That was great, so that problem actually went away. I also had leakage problems, wiring issues and cosmetic issues (apparently related to the hot Florida sun). Those are the main reasons I went away from caps.