IMO it really depends on how much power you Cub makes and how you ride it, as to whether you need one or not. Personally, I think it may help you not break a second gear cluster no matter hopw much power you make.
I would also like to hear from someone that has run one, since I am also thinking of buying one or two of them. I am unhappy with a few other parts like this that I ran in the past, including two that I made........ :cool: