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@hassanr
if you want a very noticeable upgrade for v-brakes, then definitely go for Avid Ultimates. I've not been on court with the Arch Rivals yet, but just on the commute home they are noticeably less stiff than than my ultimates. The Rivals do seem pretty good, better than standard Single Digit 7s but not a hair on the ultimates
@max - and I was wrong about the built in arch. after looking at it set up on the bike and doing a bit more research, it turns out it's not meant to be (nor does it works as) a booster, it helps the arms keep the pads parallel to the rim (like XTRs) and keeps the pads orientation centered on the rim.