I ran their ads for a month and reached the payment level. They then shut down my account. I wrote about it on this forum. A week later my account was re-opened. Today I got paid. I'll try them again on a small basis and see what happens. I did make some money but it was a battle to get it.
My advice is to stay away. I did get paid but not until I complained about Media.Net on this forum. After I got paid I ran one of their ads just to see what would happen and it appears they are not tracking the sales from that ad. I've pulled the ad and am moving on. They are not worth the hassle.