The integration was simple... my co-founder timfbowen did all of it in a couple of days.

However, we did get rejected once because the ads wouldn't disappear when users are offline. In our app, we need to have some sort of restriction or ad offline (because it's mostly used offline), so we now show a house ad after we disappear the iAd when the user is offline.

As for numbers, we'll be excited to see and I will share. We have about 100k people who upgrade the app when we do releases now, and over 1,000 downloads per day, so we are hoping for a decent CPM and more revenue as the userbase grows.

The integration process was really easy. You just include the iAd framework and then add ADBannerView objects wherever you want them. The ADBannerViews work like pretty much any other view with the exception that they must be a certain size. There are callbacks for when the banner loads to fail and if these are called we display our house ad instead of the iAd.

I found this guide to be helpful: http://useyourloaf.com/blog/2010/7/13/adding-iads-to-an-appl...