Aaron L.
Yelp
Fight Club OC is fun, different, and certainly entertaining. I don't follow boxing or MMA that closely, but seeing it live is pretty cool and worth the admission price (at least once).
I had the opportunity to view 3 featherweight boxing matches, 1 heavyweight boxing match, and 1 MMA match. The featherweights look like kids, the heavyweight was a strange match consisting of a short fat guy and a tall skinny guy, and although the MMA was more about technique than anything, they still managed to beat the shit out each other pretty well. All fighters were somewhat local, and the tall heavyweight guy was actually from Costa Mesa.
TIP #1: They post coupon codes for ticket discounts on their Facebook page.
TIP #2: Make sure to submit your name and email to the raffle as soon as you arrive. They'll do a drawing for a little bit of cash after each round, and you get a bonus if there's a knockout.