Is it well supported under Linux?
I've been keeping an eye on the state of Linux on the first gen of X Elite and it's sad that the potential is not fully materialized outside WoA. Take a look at what peeps are going through:
https://discourse.ubuntu.com/t/ubuntu-concept-snapdragon-x-e...
No, not at all, those machines are currently unusable on Linux.
Qualcomm has been upstreaming Linux support for some of their chips but they're not working fast enough and I don't think the latest chips are there yet unfortunately.