When I first started in r/c it was the cool factor that led me to buy a .91 Surpass. That was followed by a .40 and then a .70 Surpass, which was converted to CH ignition for a Lanzo Record Breaker (another story). They are a lot of fun to run and offer a nice change from 2-cycles. I like owning both. And I think each type has it's strong points and weaknesses, like anything else. Sometimes I need to have my ears split and get that ringing that throws off your equalibrium. It's also fun to listen to the purr of the 4-strokes. I've also noticed that the exhaust smells different from 4-strokes, which I like. *E-power folks are shaking their heads*

BTW, I just ran my old .40 Surpass this past weekend for the first time since 1992. I did check the valve clearance, but left in the original OS F glow plug. It still does around 11,000 with an APC 11x6 which is good for that engine. I plan to put it back in use and expect to get a lot more time out of it. And I wore out an Ace 4-40 with that thing.

I'd like to try a Saito. Especially since they have become so popular lately. I had a friend who had an old Enya .80. That was an impressive engine, too.