Nick, when I first got the Extra I figured it would be a nice scale, sport flyer, due to the smallish control surfaces......I went with the GMS .76 just because it was the same size as the .61 and had more power........when I flew the Extra, I quickly found out that the control surfaces are very deceiving!! The plane is WILD....it's not a full-out 3D plane, but it is extremely agile and the increased power really brings out the best in it.......the moral of the story is, go with the 2 stroke on this one.