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However, Kontera ads seem to confuse our users, and some find them intrusive and misleading. Kontera has made some investment in improving the load time of their script (but not much - my original load time is 0.10 seconds with Kontera, it got to 1 second).
But after 2 days of using them, I had to pull their tags because even Google is unsure if Kontera is against their TOS. Some Google reps says it's fine, but most of them says NO.
I think Google's main concern is that Kontera competes with their ads since they are in "text" format similar to Adsense.
A user here made a good point, when I start using Kontera with Adsense, my page views has dropped (though not much.)
The staff at Kontera seems to be responsive and very nice and professional, but they need to work with Adsense and make it official that it is okay to use them. They say they have a lot of big publishers using them with Adsense, and they are saying the truth because I've seem a lot of big sites using both. But still, probably Google hasn't checked their site yet. If Google did find out about those site, Im sure they will not get banned right away. They will be advised to remove them. So far those big sites, I know 6 of them, still use Kontera and Adsense together but I have no way of know for how long they've been using them.
I'm sticking with Adsense for now because I earn more money from them. I'm concern that if I start using Kontera, my Adsense revenue will drop.