Kaz, I'm not completely fond of the advertisement aspect myself, but it looks like it can be user controlled as to what you get. I do like the idea of gas stations with gas prices popping up on the screen. As you know when you're on a major interstate (at least in California) gas prices can vary by 50 cents a gallon. So I do like that idea.
I like the idea of being able to plan and check the route on the iPad and then have it wirelessly upload to the GPS. You need the big screen of the iPad to check the route and make sure it's not taking you around in circles, but once that's done the small screen of the GPS works just fine.