I have joined Underdogmedia for 8 weeks. Their POPunders is pretty good so far around $1.70 - 1.80 per 1000 pops..You can make a decent money if you have traffic on your site. Read is my reviews of this company Underdogmedia : http://forums.digitalpoint.com/showthread.php?t=1399097
Has UnderDogMedia paid you? At a rate of $1.70 CPM I expect they have ActiveX install prompts and harmful to users? Looking to monetize the site, not scare away the users.
It worked great for me so far, never hear a issue from our users since. Their ads were awesome so far, no virus.. It paid. I received once on the 26th this month and Net25. I suggested your withdraw method select Paypal because it pays faster. Here is a Screenshot of the report: http://forums.digitalpoint.com/showthread.php?t=1399097