I have to defend that one... I have one, it's been a while since I've used it, but last time I did it ran pretty well. Not too bad for a cheap BB .40

The worse engine I've had was a O.S. .25 FP with a RNV. I had it on a global tequilla sunrise, and there weren't very many times where it landed with the engine still running. Everyone was trying to figure out what its problem was, but we never figured it out. That tequila sunrise glides like a brick too...

For what its worth the Norvel Vmax-7 engines for the Lite Machines Helicopters have a really big problem with snapping con-rods. Although they are excellent engines right up to that point...