I guess I am the only one happy with my CGM Ultimate/Os 91 Surpass 2. I use a 14X6 prop. It balances right on the money with this motor with no extra weight and will fly like a pattern ship. I cannot do 3D but can do any standard pattern acrobatics. I bet the power to weight ratio os better than with the full scale Ultimate. If I had to do it all over I would go with the Saito 100 and 30% nitro fuel. I think you will very be happy with the Saito 120 if you can get creative enough with radio placement etc to keep from adding weight.