I have just physically reviewed all OS in search for a replacement for my old Palm: it's organizer software is still the best. Very stable: not a single crash in years; good battery life.
Cons: Old, low resolution and color depth, no GPS, needs a stylus
Very clean and cheaper than most European capitals. Women can walk around at 3am without getting raped or robbed – this city ranks #1 in quality of life.
Cons: The passive-aggressive attitude of the Viennese people. Not so many things to do on weekends. It's not a "city that doesn't sleep".