Pretty much what Charlie said. Our average wind speed at my field is 17mph and these small bipes are flown here a lot and none of them have a gyro. I only flew one bipe with a gyro, a giant scale fleet and the gyro was on the rudder so it was easier for the owner to take off and land. I didn't care for it at all, it tended to fight you. It was on a switch so it could be shut off during flight.
I question why a bipe would need one any more then any other plane?