If you've spent any time on Zillow or Trulia you've probably wondered: how accurate is the information you find on those sites?

Not very, according to a new report featured on Techcrunch today. But there's a big grain of salt: the report was commissioned and paid for by Roost, a new competitor in this space.

Still, the comparisons and the data are interesting. And so is the discussion toward the end of the post on whether quantity trumps quality when it comes to listings.

My own personal experience is that Zillow has become an industry standard for the valuation of a home that's not currently for sale. But I don't know anyone that turns to it if they are in the market for a new home.