Don't be too worried if it doesn't take your regular route, I've tested it around town and it rarely chooses routes I'd pick. (But then again, my 1 year old Garmin doesn't either.) I suppose what matters is whether it gets you there without too much trouble.
I'd suppose if you enter your trip into MapQuest's website, you'll see a route close to what the app gives you.
I'm on a business trip next week, I'm going to test my theories first hand, leaving the dedicated GPS at home.