well, depends. all expo does is make the movment softer around the center stick, if u find that your model pitches violently fore and aft int he hover or you find it all very twitch, yess go for it. dont add to much, add little by little till you like it

foofy: cougar coul have been repairable. but i decided to throw her away as she has provided me with 2 years of had every weekend service, and the owner befor a year. it was lookign emmbarrisingly tatty aswell