I always find the 46LA bashing interesting. I have one that I bought used for $40, and it's a terrific little engine. It runs great, starts easily, and has sufficient power to pull my 40 size Super Sportster Biplane around very well. With the 46LA the plane is quite fast, and has decent vertical.

I DO agree with tigger though; it would depend on the intended purpose. I wouldn't put one on a 40 size aerobatic plane, at least not one you were going to use to try 3D, but for a sport plane like a Kaos, or 4*, or Sportster, I think the engine would make an excellent choice.
Dennis-