I bought this kit when it was released and ONLY just put it together a few days ago. This is my second Funjet... I gave the first one to a friend to enjoy and bought the new Ultra. Amazing quality. The foam is much more dense and has a lot less flex. It has a slightly "plasticized" feel to the surface. The bumps under the wing are a welcome addition since it makes finding the CG after battery fitment, extremely easy and accurate. I used gear that I had on hand; servos were Hitec HS65, Motor was a Neu inrunner rated at 2800KV... battery was 2250 4S and controller was a Castle creations 60amp. Prop is 4.7x5.5.... Being a 4S setup and with this heavier motor, the wingloading was a lot higher than my first funjet on 3S, but it absolutely hauls. The extra mass makes the plane feel more "locked in" and stable. Launches need a good firm throw and the torque from the motor always makes it rotate to the left.. so you just have to be ready on the sticks! First flight was uneventful. No trim was needed apart from a touch of downthrust... this is adjustable and built into the motor mount. Just needed to turn the screw 1 turn. It still flies very stably at lower speeds but when you open it up, the prop just screams and the Funjet performs like a turbine jet. Very happy with this model. Will try out different packs and prop combinations, but so far, it is near perfect.