I Still have a Ultimate Kaos, with a Super Tigre .90G. With Std BB servos, and a 13x8 prop it is a super fun plane. It would be perfect for learning four points, slow rolls. It does knife edge circles, but it wont climb in Knife Edge. Comes in nicely for landing. It's only real drawback is it has a hard time spinning. (sometimes it won't even break for a positive snap.) I think It is because of the blunt thick wing, not a cg issue. I replaced the plane with a Widebody .60 and a .91fx, and I like it better, but the plane does not provide the gentle learning curve of the Kaos. IMO, the Ultimate Kaos will get you through intermediate, but it was one of the most recent of all the Kaos'.