I'll stick to high end race ported gas engines. They're fun and loud, but still really easy to tune and maintain compared to nitro. There are some absurdly high power modded engines available now days. I'm sure a big brushless motor on 8s has a lot of power but the throttle response and realistic feel of a gas engine is part of the fun. The instant torque of a brushless motor is impressive but feels less "real" to me.

Anyone have a link or more specs for the Castle system?