i know some people who've had them and they say power shifting is much harder and it seems harder to get into gear, everything i think about those things i imagine the owner has like one t-rex arm and has to use that to shift
It brings the shifter closer to the steering wheel. In racing, you are able to keep your hand on the steering wheel more often, and maintain better control of the car.
I believe both Matt and Dylan have Circuit Hero shift extenders.