I know the carbon mast is the hot topic these days, but I thought I would provide some info on the high wind kit I purchased from US Yachts for $325. I installed the high wind kit on Breakaway a few months ago. After sailing a couple of times, we decided to add some 1/2 inch PVC to the wires. The PVC extends from the top of the deck fitting attachment to about 6 inches below the mast fitting. The PVC can be lifted up to reach the top locking nut on the deck fitting attachments. Before we added the PVC, the jib clew blocks would get a bit hung up on the wire. These blocks also scraped some of the vinyl off the wire as they were pulled around. The PVC solved all of these issues. The kit is otherwise well made. The deck U fittings come with diamond shaped backing plates.
I have noticed that the high wind kit lines load up from one tack to another so it must help some. The slide on the bottom of the sail fits in above the mast fitting, and with the cunningham on, you quickly forget that the sail slide is not all the way down to the gooseneck. With the PVC, the high wind kit has not gotten in the way at all. In fact, it is useful having some additional hand holds near the mast (esp when getting on and off the boat on the trailer).
Photos attached.