Greg Bwrote a review of Shimano XTR M9020 Trail Brakes on December 1, 2016
Familiarity: I've put it through the wringer
I have a pair of these (XTR Trail BL-M9020), and they are horrible.
One, they’re afflicted with the "WANDERING BITE POINT" issue (well-said, Justin B). With that, rotor pad rub comes and goes. I’ve spent much time and money trying to resolve this, but no-go. This is quite frustrating, and dangerous.
Two, the “Free stroke adjustment” screw accomplishes nothing.
I too will be taking this up with CC and/or Shimano.