For a general sport flyer on a budget I dont think the Jett engine is a good fit for a 4*60.

I see most engine problems have more to do with operator error than the engine. I fly almost all super tigre, tt, and magnum engines (budget engines) and dont have any problems. In fact I cant even remember the last time I had a dead stick. There are other folks in my club flying OS and they are always having problems. Its not the engine.

As far as lifespan that also has a lot to do with the operator. If the engine is run lean and not taken care of it wont last long. Even economical sport engines have an incredible life span. A friend of mine has a .60 bushing 2 stroke that is 15+ years old and has hundreds and hundreds, if not thousands of flights. It still runs like a champ.

OS's are nice engines but overpriced. Look at the ST 75 or 90 or the magnum 90. Those are great engines at a good price. Also lots of folks here sing the praises of the tower 75.

On a side note, the actual model is the cheapest part of the plane. On a warbird kit I just bought I think I will end up paying 4X-5X for the radio, retracts, engine and other accessories as I paid for the kit.