We had SunRay at a municipality here in Sweden where I worked at the IT department. I tought it was really cool and I had built our own "session routing" script that could connect terminals to different servers based on the smartcard ID. Terminals in the schools connected to a school server where students could login without smartcards, but if a teacher inserted their card it would connect them to the "admin" server or to a windows VM.

I had my own server in the DC that I could then connect to from my desk using a multi-monitor SunRay terminal. At home I had a SunRay connecting in to the office with VPN. I could move between terminals by just inserting my smartcard in whichever terminal I was at. There was even a company creating a SunRay laptop called Gobi that I tried using , but a regular laptop with the software client was a much better experience.