I built an aggressor II last winter and have about 25 flights. I've been using a puffer pipe and it runs flawlessly in the air. I have had it die on my landings but it's probably because I bring the idle down lower than I really need to. I had to richen the low setting a little to get a better throttle response but otherwise it really throttles up nice from 1/3 to 2/3 to full power. Jim