As a listing agent, I find it downright pathetic that Zillow takes all of our hard work, photos, listings, descriptions, and measurements and then charges us agents to have our name next to it. And for everyone who says the agents never respond, let me tell you, when I get 10 emails a day for a $18,000 listing (I'm not kidding) and I reply to each of them within 10 minutes, regardless of the time of day or night and I never get a reply from my reply. After 3 months of that, and countless emails, you just don't care to take the time to look into the properties "window shoppers" any more. (Half of the stuff on Zillow is wrong anyway, If it's any kind of deal, its usually long gone by the time you see it.)