Best interstitial network?

What is your highest eCPM interstitial ad network at the moment? And how much is the eCPM?

A lot of people here are hating on startapp but not me - top app ecpm - $5.72 - the rest $1-2.50 startapp

5.72 is really high. Is most of your traffic coming from US?

not really -look here [

What about other networks like appnext, appbrain, revmob, mobilecore? Does any one have some stats on their ecpm and fill-rate?