I remember using them back in 2008 and had to remove them because the ads were unsafe, malware, redirects, etc. They recently contacted me, trying to get me back. I know they don't have the best CPMS, but I'm more concerned with the safety of their inventory... if they finally cleaned things up.
I tried to use them but all they served me was 'ad council' ads. I gave them about 80,000 impressions and didn't make a cent.