I'm an OS man,I have 3 46FX motors and I love them all.But I haven't tried the Evo yet I here they are good also.My FX is starts so easy all I have to do is hook up the glow starter and give the nose cone a flick with two fingers and it cranks right up.The key to any engine is to break it in right and dont abuse it.Any good motor can give you problems if not taken care of.If you chose to go with the OS stick withthe FX it may cost more but will last forever if run right.The LA will pull a trainer good but may have problems with a good second plane.Good luck and have fun![8D]