Ultra Stick is the most aerobatic. It also has a good size rudder with couter balance for great flat spins, rudder turns and knife edge. There are a few threads on the Stick about not flying knife edge easily. It actually flies knife edge very well but requires a good deal of coupling with elevator and aileron. The Ultra Stick also comes with both full length ailerons and aileron / flap options in the box and you decide which way to build the wing. The plane flies best with the full ailerons if you like faster roll rates, hovering, rolling circles and harrier rolls. You can still program flaperons into the mix for short take offs and slower landings with the full length ailerons. If you build it with the aileron / flap option, you will have the normal flap funtions and the ability to fly in crow mode. Crow brings the flaps up and ailerons down which allows you to point the plane straight down without gaining alot of airspeed. It also requires two more servos.

I flew mine for quite a while with the OS .46 AX and it pulled the plane around just fine. It would even allow you to hover at around two thirds throttle. Three months ago I went to the new OS .55 AX and picked up quite a bit of speed and the power to hover at around one half throttle.

As a fun fly plane, the Ultra Stick is perfect and if you decide to try more extreme aerobatics, you will still have a plane that can handle the job.

The second picture shows the .46 AX and the third shows the .55 AX.