I'm running ads on the content network. I don't have enough data yet to compare it with the Google content network.
Some keywords with msn content network are pure gold. I had a keyword for content that was getting me a better conversion rate than search it was weird. It was costing about 3.00 cpa for content. I ended up getting 28 leads in a week. I would definetly try the different keywords for content on there could be well worth it.