Twists really are NOT 3D planes. They're goofy fun-fly planes. They don't do any 3D moves besides hovering and MAYBE a harrier/elevator every once in a while. UCD's don't really fly well either. Neither of them fly nearly as well as even a bad profile plane. I've yet to fly a Sig Mayhem, but they look just like UCD (and they look like they fly the same). I would definitely stay away from them, DEFINITELY get a profile plane.