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Berlin, Germany
Pro: Goes just about anywhere in the city, fairly reliable. (Trains running late does happen but not as much as people like to complain about it in all honesty)
Cons: Fares keep getting more expensive, up to the point where I rarely use it anymore since I can't get my cheap ticket since I left HS anymore. Other from the usual subway discommodities like homeless people and all that I can't really think of anything. It's a pretty good system.