Steven Goemaatwrote a review of Shimano Dura-Ace CS-R9100 11-Speed Cassette on May 11, 2017
Familiarity: I've used it several times
I decided to go with the size 12-28 to replace my ultegra cassette and I am shocked by how much better this Dura-Ace cassette is in comparison. The sizing is better and the shifting is smooth.
Finally, I was impressed how cool the packaging was too!