Just a warning. There are a lot of sites that have built content by copying from other sites. I did a look over on my ads appearing on networks for my adwords. Ads are appearing and being clicked on sites having nothing to do with my target. One was a religious and the other back pain. It would be worth the time to look over your network sites and block these sites.
Of course, this is one of the main things you should be doing with Content Network - removing the sites that have low CTR (usually off top sites) and low ROI