I purchased farmed rock from Florida. It had a lot of life, much heavier, but the life on it surpassed any Fiji or Marshall Island I had purchased in the past. I got some really nice caribbean corals that you can't purchase at your LFS unless on florida rock. Nice gorgonians turkey wing mollusk, tunicates, sponge. Buy those individually would be much more expensive than the initial cost of the rock..kinda like freebies. I also recieved bluelegs and scarlets crabs that hitched a ride, plus there were some really nice algaes as well.
There is a drawback as you can get some unwanted pest like gorilla crabs, mantis shrimp, but you can also get pest with fiji rock as well.