Hello! Thank you for your time!
The first that come to my mind...
1) It would be great to have an idea how much of the Office interface is visible at the default resolution/zoom of the V screen.
Could you take some screenshot in Word, Excel, Power Point?
2) How is note taking in OneNote with the pen?
3) Try open a large/complex file .docx file with Word (100+ pages, pictures, 10+ Mb), if you have one available.
Since you have an US keyboard, I guess a test for keyboard combinations that involve AltGr will have to wait