When I buy the (eventual) Kitfox... it will be Rotax powered, simply because convincing my insurance company to "go Experimental" will be tough enough with a very proven engine, which Rotax is... The only hate I have for the setup is the cost... it really is too damned much by a factor of 50%... don't worry, I am a capitalist and they do win the supply / demand debate every time...
With that said... I have to admit, I study all the engines that "compete" with the 912 (100 hp). Lycoming made a decent effort, but fell way short on the weight, it's still too heavy given the LSA rules... Continental, well, in my non-engineer opinion, they just fell short... The guy who put the Yamaha on his gyrocopter has some great things going, but he isn't a developer, so it's a one-off... not in my lifetime, and the Belgian engine seems like a good one but too small, and the Corvair, etc... back to the insurance company problem.
This Honda conversion and the argument the Egg guy puts forth makes some sense... You know that old flying saying? "if it looks like it can fly, it can, if it doesn't, it won't"... the Subaru didn't feel right with me, this Honda does. I have had a Honda outboard for many years... it runs like a sewing machine. The Fit engine has an excellent pedigree. The Rotax, actually evolved from a snowmobile right? And a 2 stroke one at that... the Fit, IMHO, has a superior pedigree... tinkering for 5 years will work the prop swing bugs out.
Egg is such a bad self promoter on the chat forums and in the videos it's funny, it's like watching a bad auto dealer, you know the guys with the toupes, etc... but, I have to thank him for his efforts to make affordable and safe flying for all... I do hope he becomes successful so he can make enough money to go in the lab where he probably excels... so he can get a professional marketing team...
So, Mr. Egg, keep doing what you are doing, I think there are enough early adopters out there who want to fly cheaply... just don't screw up.