I have both the Edge and the Extra in the 66 size. Both are powered by 91 FX running APC 14 by 6 props, unlimited vertical on both, balanced without any extra weight. Both are incredibly precise flyers and excellent for IMAC. The Edge has very crisp rolls, does great 8 pointers, and has a very powerful elevator even with standard servos. The Extra is all around a very good aerobatic airplane and lands more conventionally. The Edge has to be brought in slower and pointed down a bit, but it has ridiculously low stall speed. It just hangs in there without falling out of the sky, just the right tendency for hovering. Other than that basically a question of personal choice. I couldnt decide so I got both and love them! just my 2c!