Nine9Ads Exit ads?

Not sure if this is the place to post but I have seen those exit intent ad windows by nine9ads.com on some of the biggest sites.

Have anyone tried them?

walldevil is pushing them as well, I guess they make good showing those ads.

anyone?

Exit pop is a pretty popular product and has a good rates
Almost every native/content discovery network has this kind of ads

Content.ad, Spoutable, OutBrain, etc

I see.
I tested them today for free cpa email submits, got a few conversion.
seems legit traffic.
still not sure how they show my ads.