Oops, I didn't mean for my post to sound negative.
The truth is that, compared to the 40 lbs of Marshal Island rock I bought, Gulf-View rock looks WAY more alive. Just about every rock has a small colony of some sort of coral (not particularly pretty, but coral nonetheless), some form of macro algae, feather dusters, and multiple kinds of coraline algae. As far as hitchhikers, along with the mantis, isopods, and crabs I also got urchins, a few snails, and even a tiny nudibranch. I've also got something on one of the rocks that looks like a tiny ricordia, but its too early to tell.
I think that part of the fun with any tank is finding new stuff living on/in the rocks that you had never noticed before. Gulf-view really delivers on the life with their rock.