When I was in high school I worked for our district’s IT department. There were a couple of Power Mac G5s that were shared, but the students working in that department were using eMacs. One year I bought the first generation Intel iMac (my first Mac), which was significantly faster than the eMacs we were allotted. I got a carrying bag for it and biked into work with it each day. That said, I wouldn’t dream of doing that in a public cafe.