I have an older one and like it. Sorry, I'm not one to tell you the subtle differences of preload adjustments and how I can tell the difference when there is 2 turns as opposed to 3 turns, or, how it stiffens up the front end as I really couldn't tell the difference on Ohio's frost heaved roads. What I can tell you is the bike tracks well, it doesn't wobble around semi trucks, the tires wear well, I also have a vented windscreen, the bike is an '01 with 81,000 miles. Hope that helps.
Mine produced a very noticeable improvement in the front end feel, responsiveness, braking, and overall feel. I would not want to ride a C10 without a fork brace.
Mine was a waste of time and money, and provides significantly less protection of the fork seals to boot. Bike still wiggled around trucks or cross winds, etc. I suggest SiSF's cam gear is a much better value. Or just more gas.