Ok, so first race is going to be on Saturday with the new brakes. Impressions so far commuting and training in the dirt.... I was damned spoiled with the v-brakes. There is really just no comparison. Now saying that, I have been switching back and forth between a Paul Neo-Retro up front and the Ciamillo up front. Both seem to work very well for canti's. Chatter was not an issue with either, as I was able to toe in the pads on both. I think with a better Kool-Stop pad the Ciamillo's would work better. They have the green in there which is ok, but the dual compound works so much better. Although the green looks nice

. The Paul's already have the dual compound, and the Ciamillo's work just as well and maybe a hair better. Neither will lock up and throw me over like the Ultimates could.
So biggest bitch, pad setup and proprietary 4mm bolt for pad holder. Solution for 1st problem, get some of the dished spaces that come with v-brake pads and it will solve that problem and make setup easier. Otherwise pad setup may prove impossible. Solution for 2nd problem, bitch to creator and cry and whine until he changes it at great cost and time.
Side note. I was going to try the KCNC v brakes because they were listed at 58grams. That 58 grams is for one caliper without canti boss, brake pad, or pad holder. Actual weight is closer to 200 grams a pair.