I am guessing right now I have about 25-30 flights on it so far and it has performed flawlessly, but the last time I flew it, it was missing in the mid-range area.
It sounded so much like an ignition miss instead of an adjustment miss. It was very notable but erratic. I did not really do anything with it since then, but plan to check it out this weekend and see if it still misses. I have had engines do weird things on one outing and the next time I go out, works fine, so I don't want to jump the gun yet.
I will check the basic stuff, like connectors, spark plug and make sure that is all good. Probably check carb adjustment too because I have not touched it and it is starting to get seated in now. For the money and for my use, this is an impressive little engine.