I learned to fly back in the late 1970's-early 1980's. Learned on a Sig Kadet with just three channels. Got out of the hobby back then and got back into it in 2007. I kept my old Kadet, but lost or misplaced the engine somewhere alomg the line. Bought a MDS 38 for the Kadet. I didn't know a thing about this brand of engine but that's what the hobby shop sold at what seemed like a good price-about $50 brand new. That engine was the worst engine I ever owned.........when it was new. I must have had 30 to 40 deadsticks before it would stay running for the entire flight. The engine has about 10 hours or more on it and I would have to say that it turned out to be the best running engine I own. It starts right up, idles great, plenty of power, uses very little fuel. It's dependable and will idle all day at 2200 rpm. This engine is a ringless ABC engine and they take a long time to break in. Once broken in, however, mine runs great. I know that my MDS engine is the exception, but I will run it until it blows itself up!!!!