Now I'm definitely spoiled by the Lenovo X1 series, but I'm not happy.
The hardware is a rebrand from clevo-computer.com - some minor spare parts can be had from there.
The system is VERY prone to overheating, the fan is noisy. They claim the fan noise is "not annoying" which is only true in the short term. I have opened up the bottom shell and I believe the fan recirculates a bit of hot air back into the case. This really is a limiting factor for me, I'm considering an alternate cooling solution.
The case had a minor chip in it within the first ten minutes out of the box (I don't know how that happened, I think it just pinged off by itself!). The palm-rests are starting to show dark spots. My barrel jack power connector is loose, I have to hold it in with a rubber band. (I still have the usb-c port) All the rubber feet at the bottom fell off quite some time ago, superglued them back on. The (super compact) PSU started to whine, that was replaced under warranty - but is stated to be a consumable item!
Out of the box they have their own OS, which is a somewhat modified Ubuntu. My main driver is Debian and almost everything worked right out of the box - sometimes I got back (usb-boot) to their distro to validate things (see: support).
The firmware is more than okay for me; I managed to cross-compile their "control centre" to allow me to change performance/fan characteristics on the fly. The uefi updates work fine (boot from a stick), but they are undocumented.
The support is ... rigid. The first response is to boot their own distro and kernel. This is fair for a mass market product I guess, but I somehow hoped that specific questions would find their way proper Linux Gurus (tm).
There is a very cute penguin instead of a windows logo on the keyboard :-)