I haven't flown it yet (hopefully this weekend), but I just finished assembling the Hangar9 Ultra Stick 40 and was TOTALLY impressed with the quality of the ARF. There wasn't a single wrinkle or sag in the covering that needed follow-up attention. It went together extreemly quickly and easily. The only difficulty I had was getting the radio programmed to utilize all the control features of this plane. But even if everything were equal, the US40 has an adge over the others in that it comes with both full ailerons and quad flaps and complete instructions on building the wing with either option. You can download the manual from Horizon Hobbies and evaluate the instructions and the detailed radio setup instructions for many popular radios.