looks like shimano beefed-up the carbon carrier on their new MTB 11s cassettes. just got one friday, a bit early. was a bit worried/curious to see what they'd done, esp with the low cadence/high torque that characterizes typical mountain biking. picked up a DA cassette (revised model) to go on my wife's bike. they added a 2nd set of rivets to the 2nd-largest carrier. we'll see if it develops any play or creak.