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The transit info works well here in Louisville (except for TARC being incredibly incompetent and/or unfunded, but Google can only do so much)

Works fine in my town of 3,000 people that is 15 minutes outside a "metro" area of 200k people.

Works great in Seattle as well.

For me, it's not as good as OneBusAway (although obviously the UI is much better); the bus times are a bit off for the bus I get to work.

Works fine in the megalopolis that is Pittsburgh

I know everyone else is saying this, but it also works in NYC and a lot of the tri-state outside of the city.

Works in Washington DC too.

worked for me in Boston, Portland, ME and Portland, OR

It works in Montreal, Canada.