The standard map is really pretty awesome and very fast. While doing a side by side comparison with a google map on a droid while traveling though Chicago, the Apple map was at least 5 times faster ... especially when zooming in and out. The vector maps are so much faster zooming and downloading. The Traffic congestion shown with red lines were dynamic (changed in real time) and very accurate.
Integration with Siri is cool ... I just tell Sire "get me directions to ...." and boom, it starts turn-by-turn (no need to take my eyes off the road).
The Satellite view improved dramatically with beta 3 to the point I couldn't see the difference with google maps in my area (Minneapolis/ Saint Paul) but no 3D for here yet. Looked at 3D for Portland,OR and it was almost surreal in the way you could move around buildings, very cool.
Public Transit not showing anything yet. I believe Apple with pass your location to 3rd party routing apps which may be better in the long run ... rather than relying on each transit to pass accurate info to google. I'm sure this will rapidly develop.