I am running a few behotec motors (66hp, 180 gold and a 220) and all of them operate flawlessly with many hours on the clock. Not that I would expect something different from an engine produced in larger numbers, so just mentioning. The JB220 in our Airworld Hunter produces 22,8kg of thrust and is now flying its second season in the model with a total of 20 hours running time. What impresses me the most is that the motor does not change its habits even with 38 degrees celcius - yes it's been a hot summer here in Germany. The kero start sequence on those engine is smooth as silk and the engines never spit or cough (whatever you may call it) on acceleration or as mentioned in hot weather or high humidity. I would never start to argue about thrust compharisons to other turbine engine brands but to me it seems that the behotec's are keeping their promises in terms of manufacturer specs.