I have a version of the extra 300 that will harrier inverted, upright and most of the other 3D stuff, except waterfall. Every time I make a plane waterfall, it flies like #@&#% doing everything else.
Major mods are needed and although the parameters don't represent any kind of airplane I know, they do fly kind of close.
I think I have some video from last year that looked really cool, I will try to post it later tonight. IF anyone really wants a challenge, try hovering the Fokker Dr1, it's fun. If I remember right, I think that it needed a bigger motor to do it, but that should be it.

"if it isn't broke, push harder"

Scott