Colin C.wrote a review of Shimano Dura-Ace ST-R9100 11-Speed STI Shifters on May 17, 2017
Familiarity: I've put it through the wringer
Love the shorter throw of the 9100 levers. Grips and set-up are definitely improved, the feel of the hoods is similar to 9000 but they don't seem to get as gummed up. Same great braking feel and lever modulation as 9100.
NOTE: Would recommend running modern shallow-drop bars with these levers given the tad shorter lever throw. Older style bars with a deeper drop will limit the ability to set up the lever throw in correlation to how close the pads are to the rim when not engaged.
Shifting is a bit lighter than DA 9000 but every bit as solid.