I also recently got a Surface Pro 6. I got it used for $200, but it was in great condition, low battery cycles, and came with one of the keyboard covers. As you said, everything works. Gnome in Wayland is pretty good for touchscreen. I also got a third party pen for it that works great in Krita and xournal++.
I wish using it as a tablet was a bit better supported in Gnome or other DEs, and the battery life is only ... OK. Still, as a thin and light linux tablet I can carry in my bag to work on light tasks or look up content it's fantastic. The keyboard cover also makes it great for typing, programming, or opening remote shells on the go.
Glory to
Arstotzka... I mean Alphabet.