I'm guessing you are looking at the tuner secondary. I have some experience with the 11". Works well, uses the old style cat helix and torsional springs. I think it's only worth the money if you make a lot of helix changes. If I was racing a lot or going from flat land to snow to grass then I would get another but for someone that lives in the mountains and ride the same places all the time I don't think it's worth the money. There are lots of good torsional clutch kits out there for about half the price. Here's the link to the site in case you didn't have it.
