I have a pair of these (ok, I have one and the wife has one).
Much better than using an expander ring, very happy with them. No weigth penalty over XT + expander ring, large sprockets are in groups on a carrier so no digging in to the freehub for you Hope Pro 2 users.
We have them both running a mediaum cage mech (on a 1x FS) so I would imagine a short cage might be suitable with a hardtail. You might not have much wiggle room if you wanted to go up a chainring size though, someone who uses a short cage mech might suggest what their range is.
I will say though, that we upgraded both mechs from long cage to medium cage using a rad cage, which has an offset top jockey wheel. This improved shifting performance noticeably.