Also consider a LazerLite. It is solid like fiberglass, locks and lifts up like fiberglass but has some nice features fiberglass does not such as can be put on and taken off by one person, lower/sleeker look, and you can open the tailgate even though you have not opened the tonneau cover, a really nice feature when you need to get into the bed of the truck in a downpour.
I almost bought the ARE, but decided LazerLite was a better match for my needs, and I love it. You can search for LazerLite on here and find tons of pics...
