pop under review : your views

Fellow "Digitalpointers" in your own experience which pop under ads company is the best . for example
1.the type that counts / doesn’t ignore clicks from most or all parts of the world .
2. Pay rate per click
3. Compatibility with websites examples blogs , forums , websites etc
4. pop up frequency setting example set ad to pop up every 3hrs or every 6hrs or twice a day etc.

See original post by muchochiz