XX1 sounds good but the price of the cassette is bonkers!!
And you'll also need the dedicated DT Swiss/Sram rear hub if you want to use that cassette
Apparently there are quite a few other companies signing up to make the freehub as well, I'd imagine Hope are one of them. The good news is that it is just the freehub that needs changing, whereas the Shimano road stuff has a different spacing, meaning a whole new hub.
I guess it's aimed at the Enduro crowd. My only concern would be the jumps between ratios; I sometimes find there is too bigger jump on my 11-36. On the other hand, it would give me an easier gear on my 1x10 which it lacks for really long or steep climbs. Will be interesting to see how Shimano respond.
In the end I think it's good that Sram have moved beyond grip shift and taken some market share off Shimano because it has forced both companies to up thei game. And we get better products as a result.
2015 Stanton Ti Switchback
2006 Specialized Demo 8
2013 Specialized Allez Sport
1999 Santa Cruz Chameleon
1994 Cannnondale Beast of the East (rebuild still in progress)