I have a x1 but I also have 9000 songs and that turn wheel is a mess.
That helps a lot, actually...If you're not a fan of the turn-wheel, and you've got a library that size, I'm not sure that the slightly better tactile feedback (only read about) on the newer models is going to help you much
Pono's UI has an, what do these folks call it? I don't know, an alphabet-thumber? I'm taking credit for that..
Swift, lean, operation on Pono's UI...People do complain about the lack of EQ, maybe, but, Pono's UI is spartan and quick, and has all the basics covered, IMO.
It does the job...YMMV.
I know H20 has the X3ii...much more knowledgeable on how much they've improved the wheel in practice.