The NX series are decent engines. It is not the same as the .45/46 trainer engine. Some people have good experiences and some bad. Most problems have been around tuning because of the limiters, exhaust baffle, and other variables. I have OS, GMS, TT, Evolution, etc. and if you know anything about glow engines you should be fine with the Evo engines. I have one that has been running for well over two years now without an issue. It starts easily and runs like a champ.

We have several of them at one of our flying fields and they have all done great. If you don't have a lot of experience with glow engines, it may not be the easiest to get tuned until you get used to it or maybe get someone that has previously worked with Evo to assist in tuning.