I have a TUXEDO Book BU1407.
The hardware support is quite good. It works with mainline Linux without requiring proprietary drivers or firmware.
But the laptop is very noisy. Sometimes I have to put a T-shirt or something under it when I want to watch a movie in silence without hearing all the vibrations it causes on the desk.
It also has a big bright power LED that is very annoying and I have to cover it when I use it in dark environments.
In five years, I had to replace the battery or power supply twice, which they didn't sell and I had to buy from third parties. When I contacted support to try to diagnose why my laptop was not charging, their reply included expressions like "We can't do magic. [...] We can't see into the future and we can't be clairvoyant either" which I found very rude and unprofessional.
For all these reasons, I will not buy TUXEDO again and I think I will give Slimbook a try the next time I need to buy a laptop.