This is the lightest and quietest Freewheel cassette I have used. I own two of these. The first one has 14,000 miles on it and looks and performs like a new cassette, I bought a second one to go on a new set of wheels. It was significantly cheaper than the first one was. A much easier purchase. I use it with eTap, but I am told that it works quite well with Dura Ace or Ultegra.
This is a nice piece of gear. Very lightweight, impressive to hold in your hand as you appreciate its machining. My 11-32 version shifts nicely with etap wifli. It's hard to call it a good value at its price but for weight-weenie builds it's the way to go.
I have a few of the previous XG-1190s in various sizes and weigh them all. I was rather disappointed when the 11-28 cassette came in at 168g which is 10 more then my other two 11-28s. The new version is Identical to the old with the exception the back no longer has a 22 and the words Sram and Red switched places. Don't get me wrong it's still a great cassette as the original XG-1190, but I was under the impression there was something new and I was gonna shave a couple grams on my new build.