Tried it out and it's only okay.
Some observations:
-Bummed that I can't view directions from the lock screen, nor do they show up in the header when I leave the maps app to do something else on my phone. Sounds silly, but I'm not always the one driving so it's nice to be able to actually use your phone while getting directions.
-Definitely not as clean as apple maps, but that's okay.
-Awesome how it shows you how far away a place is just by searching, you don't have to pick a route before seeing how long it will take you.
-Apple maps has a better overview and better switching between overview and directions.
-Apple maps rules in that if I am going somewhere I can search for say 'Starbucks' and it finds me starbucks that are along my route. Google maps doesn't do that... that is probably that greatest innovation in maps that iOS has seen, and google didn't include it.
-No 3D maps is a bummer, I know there is google earth, but come on...
-Also the city view isn't as nice, to be able to see restauraunts or coffee shops you have to zoom in super far and it's kinda pointless.
They both have good and bad features. I'll use apple maps to find where I am going, and if it's wrong then I'll use google to get the correct address, though I haven't been mislead yet *fingers crossed*
Using both apple and goolge maps together will be great.