Agree with what was said above. I would add it is not great at knife edge. The tail is just to short. I've seen people make the rudder bigger and this helps but it's still not great. This is the only shortcoming I've found with it. It does nothing to surprise you. I've flown them with Saito .72 and .82 power. Along with ST 51 and OS55 for power. The Saito 82 is my favorite for it even though the install on the throttle linkage was a bear.
David