Zillow’s main value, as far as I’m concerned, is that it is usually pretty accurate at identifying the location and lot lines of a property. And just from experience, our house here sold in January, and we discovered later that it sold within 1% of the “Zestimate.” As it turned out, we didn’t use an agent (although we compensated the buyer’s agent), so if we figure the price that we would have sold it for using an agent, the “Zestimate” was more like about 3-4% low.