Cassette is not flashy, but it's a workhorse, durable, and a good value. Weight weenies will look for the minor gram savings going to Dura-Ace or Ultegra, but I haven't noticed any differences in shifting performance (running a DA9000 groupset with Ultegra6800 long cage rear derailleur)
I am pretty happy with the 11-28 cassette. I run it on my new rain bike and really , its a great gear selection. I really wish the 11-25 was available in the 105 level but there is a 12-25 I may consider. Like any Shimano drivetrain component, its flawless. Shifting is smooth and precise. Seriously if your running 11 speed shimano there is an even cheaper cassette, not much diferent in function from my Ultegra 11 speed cassette.