Quoted By:
Oslo, Norway.
Pros: Runs pretty reliably, not a lot of delays, on the more central lines trains pretty much come within 5 minutes, although on some of the other ones it can at the worst be around 15 minutes per train. It's also quite affordable as a student, and the student ticket also includes buses, trams, some trains and ferries to islands in the fjord.
Cons: I wish it reached more of the city centre, but the city is fairly small so it's usually not a big problem, especially since the tram and bus network is pretty decent. Overall I'm quite pleased.