Nothing shifts as good as the Dura Ace cassette. I installed this on my good wheelset and anxiously await Spring for me to get the good bike back out. Till then it's my clunker bike with the Ultegra groupo that shifts nice but definitely not as good and responsive as Dura Ace!
I use this with a 7900 chain with Ultegra 6703 on the front. I think this works better than Shimano's recommended 6600 chain with the 6703 up front and ultegra cassette in the rear. I love the 11-28 option, as I do a lot of steep climbing. Nothing bad to say except - wow - pretty expensive.