I agree with the above. The Futaba GY series gyros are definatly the way to go on a Trex. Ive flown my friends Trex 450CDE with the Futaba Gyro, and its locked in and it will NOT move. Its unreal how steady that gyro is, but you have to combine it with a high speed servo like the Hitec HS-56 or something to get the super smooth performance out of it.

I plan on getting a Trex for myself for Christmas, and a 9Z radio to go with it, I can tell you....the Futaba gyro is definatly going in mine. NO EXCEPTIONS.