eri2499850 wrote a review of SRAM Cassette XG-1080 on June 1, 2014
Familiarity: I've put it through the wringer
I have over 500 miles on mine (11-36) and it still shifts like it's new. I'm pretty heavy and don't always shift at the best times but it's still going strong. The XX is really nice as well as the XTR but the XO costs less than the XX with a minor weight penalty while remaining lighter than the XTR. You can't go wrong with this.