Peter Nwrote a review of Shimano XTR BL-M9000 Race Brakes on April 25, 2016
Familiarity: I've put it through the wringer
There may be slightly lighter brakes on the market, but none work as well or as reliably XTR Race do. While Shimano calls these their race brakes as opposed to their trail brakes because they lack Shimano's Servo Wave technology, you could arguably say that these give you better modulation instead of ramping up quickly, producing that "on-off" feeling that other shimano brakes (XTR Trail, XT, SLX) are known for. Plus, the few less grams than XTR trail never hurt either.