I am one of the 10 M. Tried it on a quick trip this weekend. The mapping itself is fine but it sucked at finding a specific location. For example, looking for a place to eat, typed in the name and it sucked at trying to figure out how to get there. Closed it, opened Siri and she found what I wanted and took me there easily vua stock maps.
Not saying Google's maps suck, it's a fine looking app and I'll keep it. But the integration wasn't really great to me.