Check out the extensive H9 Extra 260 thread in the 3D Forum. Lots of folks running this engine in that airplane are very happy.

I'm trying to decide what engine to put in mine; gas or glow. I have this kit, and the WH 73" Edge. Both are excellent kits that are well worth the asking price. I bought them primarily because of the glowing flight reports on both. You'll read about minor gripes regarding build/hardware quality; but I've yet to read a post that said either one didn't fly GREAT.

FWIW, I too want to try IMAC and have been doing a lot of reading on the subject. Most folks agree that the Extra design does better at IMAC, while the Edge is better for 3D. Then you read about someone winning an IMAC contest with an Edge, and some flip-flop maven wowing the crowds with an Extra.

I imagine you're like me; a reasonably competent pilot who would like to try something challenging. As far as I'm concerned, most of the airplanes out there for IMAC use will fly much better than I can drive them. I feel reasonably confident that either this Edge or Extra will do me quite well for my entry into IMAC. IOW, buy what suits you. We would probably agree that a Big Stik would be a bit marginal for IMAC.

Both the H9 Extra and WH 73" Edge are really pretty airplanes. But there is a ton of other ones out there, too. I spent several months trying to decide between these two, and ended up with both.

What can I say?

BTW, I'm putting the OS 1.60 in the Edge, which will be assembled first. That's a big honker of a two-stroke, eh?