Ok for raspberry pi with RaspiOS.
The tablet works very well with a wired connection and with wifi. It's not bluetooth: there is a USB dongle to plug into the computer; this gives you a better range, the device remains functional at several meters.
The biggest flaw of this tablet is its size: I didn't pay attention when I bought it, it is really big.
Tried it on the Xournal software to annotate a pdf with scans of students' copies. Works very well without installing any additional software. I have not tried to use the soft buttons.