Hey Raf, I been running a Simjet 2300 on a Kangaroo and now on a Cermark Viperjet, just about 21 flights and more starts than that, so far I'm happy with this engine, according to one of my fellow Jet Cat flyers the Simjet has a much faster acceleration, my 2300 has and older ECU so I only get 23 pounds of thrust but it is more than enough to fly the Viper jet, it weights 25 #'s dry, 29.1/2 #'s wet ( the new ECU runs the engines to 25+ pounds), also Simjet has full service now here in the USA for faster service.
I have a friend that also flys a Simjet, a 1200 ( 18#'s of thrust, smaller than a P-70 ) and when he is ready for his next turbine he made up his mine for a Simjet 2300. [8D]
He can tell you that when I do my research on something I do it well.

Hope this helps, let me know if you have more questions.