Opinions Required for Various Ad Services like Chitika, TribalFusion, etc.

Hello guys
I need some advice. I’m from India and run AskVG.com website. Currently I’m using Adsense, Adbrite and Kontera ads on my website and I’m getting good amount from these services.
I have tried WidgetBucks and AuctionAds but none of them worked good, so I ditched them.
Now I have noticed a few other Ad services:
Tribal Fusion
Casale Media
Chitika
AdServerPlus
I have seen their ads on many popular websites/blogs/forums. So I want to know your advice about these ad services. Whether they are good or not for Indians? Are they reliable? Is anyone using any of them?
Please keep in mind that I’m asking this information for an Indian website.

See original post by Vishal Gupta