According to a recent survey......not very good at all!!!! The most popular consumer search engines offer home buyers only a small fraction of the actual homes available and many of the listings shown are inaccurate or out of date! Wow, not what you would expect, it sure surprised me. The survey, taken in 3 major metro markets, failed to provide 92% of the available listings. The search engines used included Zillow, Trulia, Google and Yahoo. You would expect better from these BIG DOGS. Google actually came out best and still achieved only 69% accuracy. What is the answer for buyers looking for good info?? Use a local MLS search engine to get the best results. In the Atlanta area I suggest you use  http://www.gamlshomes.com/. They have a direct tie to the MLS system all us agents use. This site should get you the very best listings available plus a great deal of additional info. Try it, you will like it!!