I "had" one and thought it flew excellent! I am not a pro, but felt that it did well in the 3D that I could put it through. An OS 1.60 is a great match up for the 231. I did have to land mine kinda fast to keep from stalling and was the ultimate demise of the plane, but i was kinda heavy with a Moki 2.1 in the nose.

There are also some concerns about the integrity of the airframe. I have put mine into blenders and some pretty fast snaps, it never once winced.