Speaking of polls… Check out the results of the Zillow poll on sellsius° real estate blog.
They tend to show not much trust in Zillow’s Zestimates (75% of buyers and sellers say they don’t trust Zillow), but I’d put this down to the sellsius° readership (and potential pool of respondents) being heavily weighted from those in the Real Estate community.
I think the general population, at large, has a much greater tolerance for the Zillow numbers.