I used it in New York, and it also knew about line closures which other apps weren’t aware of.

One thing it’s bad at (ironically because it was made in London) is the data model for Tube stations, it seems to think a Tube station is a point, whereas they often sprawl underground over large distances. It doesn’t have much of a concept that you can be walking for 10 minutes to connect between lines, and will make dodgy suggestions on that basis.