i was using them on my blog and have 12 cents in my account so far with their 20 days usage..but i had to remove them as they have been blacklisted recently for giving undue pop-ups to visitors even when they claim there will not be any pop adverts..well not a big loss at all coz i don't want that people stop visiting my blog..LOL..just be careful with while using them as they will be decreasing traffic to your site/blog..as some of the pop-ups are directly damaging to your system specially the ones listed to red links/sites..(some of the adult sites)