The login cards were the killer feature on them(at the time). I managed a fleet of them things spread all over 4 buildings. Being able to work in one location, get up and goto another and just pickup what you were doing was INSANE in that day and age. Slapping in a keycard do it all was unheard of.
We had citrix and sunray in those days. Citrix was for those that had BIG BIG BIG money and needed windows. We were a java shop, so it was either an e450 in the server room and sunrays, or ultra5s at every desk.