People were eating Lion Fish left and right on our last trip. We had some, it was tasty. Very meaty fish.
I was told there was a fisherman who was stung by the lionfish while out at sea. They had to get him back to shore and you have a couple-few hours to get to the hospital to recieve a series of injections. The venom messes with your nervous system and the fisherman told me it was a couple weeks before the guy was "right again".