Dave,

Seems It's not only me spouting on about O.S.'s then...

My friend Ken had my Rush and fitted a tigre .51 with a 6Kg Hi-Tech servo in the back for elevator. Must admit it doesn't seem to have any problems with twisting. If it was me though I think I would have gone with maybe 2 HS-225's on them instead or similar.
I've got to agree with mc71 in that it could do with more for proper 3D'ability.

We're just testing the new Twister, imagine the Rush but lighter. I've unfortunately squidged mine after engine failure whilst prop hanging, I guess that's me of Wils' crimbo list. Don't hold your breath though, it won't be available for quite a while yet.

How'd the mixing go anyway?

Sym.