I as well as several other realtors have tried this lead generation program. Do not waste your money on these garbage leads. They work based on impressions so anyone that comes onto the website is what they consider a referral (bad names, bad numbers, pre mature buyers/seller and window shoppers). I do not even know how it is legal to sell these so called "referrals" and then sell the same "referral" to at least 25 other agents. You should be ashamed of yourself Zillow.