I used it in Manchester and it has hands down the best app UX I've ever used. It did just the right thing at the right time. Shows you exactly where you are regarding your stops, vibrates when it's time to get off, keeps working when you have no data or GPS, and asks you if you want to resume your previous trip if you open it after you close it during a trip.

I am extremely extremely impressed by how absolutely perfect the UX of this app is. I don't know who designed it, but congrats to them. If you haven't used it yet, you must.