When you start getting into bigger planes you don't want to chance pushing the limits of servos. Plus if you are planning to fly IMAC digital servos are more precise and the extra torque helps in many maneuvers. You can use whatever you want, but someday you will be pulling out of a loop and an aileron will go into a flutter and rip out of the wing because it didn’t have enough torque, and you’ll ask yourself “why didn’t I listen”. Trust me it WILL be a learning tool if you skimp on servos, just not a good one.[:'(]