We tried Findit-Quick PPC and supposedly received more traffic for obscure search terms than Google and Yahoo put together. There were zilch conversions from this 'traffic'. After numerous unanswered emails, FIQ finally acknowledged they had a problem with some of their partners.
The interface is mediocre, extremely slow and most of their advertisers stop using them after they see the poor quality of traffic. You will now see no advertisers whatsoever for popular search terms.
Check out their support forums. Our queries from as far back as 2003 haven't been answered. Looks like this is a one man job, as the same person answers emails to every address - though it usually takes about a dozen emails and threats of legal action to elicit a response.