Well Ive never tried them, intresting. Maybe you can try Clicksor or AdEngage, you wont find very good ppc's that except Adult though... You can also try Black Label Ads. good luck
ive tried Media Shakers 1 year ago, and yes, i only use them for 10 days, they're the worst cpm network i ever use
MediaShakers pays very very low. And sometime there is redirect ads in their banners which visitors wil be redirected to another site when see that ads.