we talked about this just a page back or so. the 125 is ok for 3d and will keep the plane nice and light. i have it with saito 150 and consider that or saito 180 the best for hard 3d in this airframe. i would not consider a saito 100. i wish they did htese planes like they do 50cc. for 50cc planes, they say to use a 50cc, and guess what its a great match! why they call it a 3d plane and advise a saito 100 i will never understand.