I just built my first "real" high performance electric, an Extreme Flight 48" Edge 540. I learned a lot about electrics. Namely, it's expensive and you don't get much more than 7-8 min flights depending on how you use throttle. But the power is instant, you never worry about a dead stick (nice when doing 3D moves on the deck), and no clean up whatsoever.

I plan to keep one fuel powered model around, but I can definitely see the benefit of electrics, especially since the price of lipos has gone down.