Is that a ding in the MP2 or just a reflection? I think where you are, plus all the stuff you have setup, the price aint bad at all. personally, i wouldnt touch or remove anything. leave it setup the way it is. use the transmitter for another trainer nitro. if you have instructions from the LHS, stick some training gear on it and go slowly with it.... but a 90 isnt for learning.... it will be more stable than the smaller electrics you mentioned, for sure.