Nomad, Solo, Cop, and Netrunner... are the favorite classes...
Surprised Fixer isn't getting more votes, but otherwise this does not shock me...
Also, I think the reason Netrunner gets so many votes is because the actual pnp netrunners were really no fun to run with the rules as written, which were kinda confusing and wonky to put it mildly, and took up way to much game time to focus on one character...
I know in my games I just didn't allow them as player classes for years... until the sourcebook Rache Bartmoss's Brainware Blowout came out which gave us rules for using the Wizards of the Coast CCG Netrunner directly in game as a netrunning system. That was fun stuff, but made kinda crap by the fact that the card game wasn't sold everywhere, and it was nearly impossible to get a complete set.
When I wrote IU I just simplified the netrunning to skill rolls with a revised but consistant with the rest of the game mechanic, and left the wildness up to player and GM description.