I have two Sr. Telemasters, one OLD kit version with an OS .91 4 cycle and an ARF with a Zenoah G-23 in it. The kit version flies very well and sounds awesome with the 4 cycle in it. The ARF was modified for a bolt on wing, wheel pants and a few other things. It also flies very well. Yes it's way over powered and will go straight up but when flown at 1/3 throttle it sounds and looks very realistic. Having the engine turn much lower rpms makes it sound really cool. If you buy the ARF, it has the engine bearers for a glow engine. Also spread some extra epoxy around critical areas as they really are built light for electric power.