I tried it this morning in West Michigan...Grand Rapids area....and all worked (and worked extremely well).
We're not exactly considered a major metropolitan area, so I imagine it is available in MANY parts of the US.
Lane guidance is more welcome than I could have imagined.
I have always loved the UI of Apple Maps more than any other map program and so glad it is so much better now. I still get the occasional errors, but nothing worth screaming about. Going to use it exclusively for a while and see how it does.