My two cents:

I have been flying the 40 sized cap 231ex for about two years now. Its a snappy little flyer
and is right at home tumbling. Its a little pitch sensitive and you have to correct in knife edge.
The plane is sturdy and well built. It is a good airplane for a pilot that wants
the elevated pulse rate referred to in an earlier post. By the way, the plane will do a few
3D manuevers-blender, waterfall, hover