i have owned both the ultra stick and the u can do in my opinion the u can do is the more capabel of the two it has a wider range in speed and aerobatics and a lower wing loading wich makes it more stable and easyer to recover from any manover you can learn any manover with it as for fluter i haven't encounterd any i have a satio 91 in it and have 15-6 prop on it start out mild and work your way up you wont be disapointed as far as aerbatic scale planes go i have flone them all in my opinion the edge is the best because of it's mid wing plasment hope this is some help