Considering the growing number of thieves that are caught, I'm surprised if no slutz have experiences with pirate hunters?
Come on, every pirate is worth up to $150,000 per stolen song -- this can become an interesting hobby for you!
In addition to payartists.com, I have looked at these watchdogs...
BayTSP - Piracy Protection For Your Digital Assets http://www.mediasentry.com/ How to Stop Online Music Piracy!
...but I'd still like to hear some personal experiences; services, prices, success rates, etc.