I used it in Dallas Fort Worth Texas.
Worked well enough for £6.99
Had issues trying to find addresses using zip codes and addresses. The search function worked well.
Routing worked well, started with factory settings taking me direct to the hotel from the airport.
Changed setting to aviod toll roads again worked well, changing the settings to try and avoid toll roads gave me a more direct route.
Faults
Cant seem to switch the app off.
Cant cancel the route.
The phone gets very warm.
Power hungry - if you are using it for any lrength of time you WILL need power.
In all for £6.99 it is good but I would have a map just in case.