If you’re house hunting this blog post is for you!
Trade-offs to consider 
How accurate is a "Zestimate"?
The Zestimate's accuracy depends on location and availability of data in an area. Some counties have deeply detailed information on homes such as number of bedrooms, bathrooms and square footage and others do not. The more data available, the more accurate the Zestimate.
ZESTIMATE ACCURACY/STAR RATING:
The ratings are as follows:
= Best Zestimate
= Good Zestimate
= Fair Zestimate
= Tax assessor's value, or unable to compute Zestimate accuracy- 0 stars = No valuation