Gyro's are good period. Not just for racing. Gyros resist a change in motion that isn't directly inputted. Therefore cancelling out any unwanted change in direction. Depending on how many axis are available for a particular gyro, 1-3, and what control surface they are controlling they will definately improve how your model will fly. Though some could argue, that a good pilot can control these changes by adding extra inputs from other control surfaces himself, I'd rather have it be automatic rather than try to multi-task while looking over my shoulder! The hard part, at least for me is finding a reasonably priced and good quality gyro that will fit my application. If anyone has anything to add to this, please do!