Since I put bad karma on one of their engines I'll come back and say I have one of their S/K-50 Fun Fly models and it is my favorite sport plane. I fly it year round (great on skis) and it is just one of those models that everything seems to come together on. I'd be hard pressed to say whether I prefer it or the original Das Ugly Stik. Broad speed envelope and, with 10% differential on the ailerons, will do linear rolls. And it looks good with the cowl and tapered wings.

Like Montague said, there is probably a fix to be done on this engine. I just had another (a SuperTigre .51) waiting and haven't gone back to diagnose the problem. Speaking of JB Weld, the throttle arm snapped off (four spot welds hold it to the barrel) and that was used to reattach it. Interesting thing is it popped off at 1/2 throttle and I had the longest flight of my life with that same model mentioned above waiting for the fuel to run out. She takes off at less than 1/2 throttle.