Terrific review, @wnc_rider -- great mix of technical dissection and on-the-trail insight. I, too am a fan of piloting lightweight 120mm bikes down long descents in the Appalachians though I'm sure you charger a lot harder than I do! I've been looking for a review of the the XCR Pro 4s as the combination of carbon lever, featherweight master cylinder, and beefy caliper make the Hopes a compelling option compared to other lightweight brakesets like the Motives, XTR Race levers to 4-pot calipers, Piccola HDs, or (my personal choice) Dominion T2s. A carbon lever is a 'must' in my book...