I've only used the clutch kit in snow but what a difference. You can punch it sitting still in third and throw the snow like crazy. Can't wait to try it in the spring in some mud holes. There is a about a 2 second delay when you push the trottle but the tires spin faster when it activates.
I had someone at a shop put my clutch kit in. I think it is a 2 hour job but can't really say. I bought my bike from a guy and it was still in a crate. Any service that needs to be done he takes care of pretty cheap. If you go with 28's i would get the kit. I had 27" gators before and turned them no problem but i wanted lots of power for the 28's
A pic of mine with the gators all shined up