Didn't get much of a chance to fly it due to the fact it didn't belong to me.

But.......

OS91 4 cycle. 7 lbs 10 oz Motor brand new and not broken in good yet.

Knife Edge: Pulled toward the belly. Definitely needs coupling
Waterfalls: Great! Wants to gain altitude in a Waterfall.
Knife Edge Loop: Yes it will. No Problems other than needs coupling.
Hover: Yes it will. And it has enough power to pull out well. Not blistering fast. But solid.

I did not try any flat spins or blenders due to it was not my airplane and the motor was brand new.