I really enjoyed building it. the only problem that I had was with the servos. The directions stated that any sport servo would do...not true!!! The tail rotor servo was standard size,but the three swashplate servos are mini servos (between micro and reg).Anyway, a great build IMHO...from the reference of going from Corona electric to Quick electric...just waiting for the battery packs (I can then get a reference for drilling the mounting holes in the canopy). I took a picture for another forum wher someone was looking for the size difference between Corona and Quick...I'll try to attach it here ...I've heard on other forums that the EP 10 flies great...cannot say yet first hand!