I have just broke in and flown my Super Tigre .51. I love it! It's still running rich for a few flights, but will still pull my Thrush vertical right off the runway. I fly around most of the time at 1/3rd or 1/2 throttle. When I open it up, it respondes quickly and smoothly. It's easy to start and idles at 2400rpm. I fly it with a 10X8 APC prop. I really like it.