PPC: Looking for ad network feedback

I am working on a piece about PPC based ad networks and looking for warriors who have experience with the following networks:


Media Net
Chitika
Bidvertiser
Infolinks
Clicksor
Vibrant Media
Exit Junction
PocketCents
Blogads
Kontera
CPX Interactive

So if you have used any of these networks in the past or are currently using them please provide some feedback. I'll be writing the article based on the feedback given by people here and If anybody is interested, I am willing to post a small interview about your feedback and you'll a link.

Thanks,
Ankit