only have a small amount of experience, but doing ppc with 7search and searchfeed now…searchfeed is cheaper, but i’ve had trouble with a lot of fraudulent traffic and some suspicious traffic, the type that doesn’t even let your home page download…searchfeed has been good at refunding me when i point out the problems, but it seems to be up to me to follow the clicks closely…7search on the other hand pulls fewer people at the same ppc rates, but they are all real people…i’ve even seen days where my traffic will spike, only to be reversed a couple days later…likely due to 7search catching duplicate clickers or fraudulent clicks…so i guess i would have to say 7search comes at a higher price, but you get what you pay for…