Well, if they bought it all new, return the GT80, and buy a DA100 or a zdz80. I have the sukhoi zdz80 combo, and its sweet, but with a DA100, its an animal!! Ive also flown it with the gt80 and it will hover, but not much pull out power, I honestly think you will be dissapointed with that engine if your looking to 3D it.

VIdeo's on my site below of the sukhoi and alot more!