Your not going to really notice the difference until you have been flying awhile..I keep spare of 315, 325, 335 and a set of 325 CF for my rex..335 are more stable 315 more response carbons for when Im doing some real nasty 3D..only once did I break some woodies doing 3d, but i think that was more for the fack i had them on there forever and stress finally took its toll whle doing tic tocs..anywho get the cheaper ones and play with it for awhile..