There's a guy that flies IMAC in WA and OR with an H9 Ultimate. If you go to a few comps, you could probably talk to him. It's ridiculously slow flying, even straight down. I bet you could "dial" out the rudder nasties pretty easily and you'll have plenty of time to drink coffee or smoke in-between maneuvers.

I have a small 54" Goldberg Ultimate and would not use it for IMAC. The rudder has a strong proverse roll and positive pitch. I think the newer models have shorter cabane struts, less stagger, and less sweep. It all adds up to more honest handling (although less true to form).

I say go for it. Besides, I want to see more bipes at the IMAC events.