A co worker of mine trains at GB. Im Checkmat. Went in and rolled with some notable faces of GB. Dude, for an old man, Nelson Monteiro is a fucking hammer. Very hard to get anything going underneath and you feel all 200lbs of the guy. Lots of black belts, lots of good guys to roll with. Some very strange rules and procedures. No one gave me any shit, even knowing I train at Checkmat. Everyone was really nice though. If you come through SoCal, you should try this place. Pretty cool place.