Zillow                     Realtor.com         $$ Difference         % Difference

Property #1         $568,000                   $687,000               $119,000               17%

Property #2         $454,500                   $504,201               $49,701                 11%

Property #3         $2,314,500               $1,655,060             $659,440               28.5%

All 3 of these searches were part of a Yorba Linda Real Estate comparison between Realtor.com and Zillow.com.  I am very familiar with values in all 3 of these neighborhoods and Zillow.com is much closer to true values than Realtor.com.  Ya think it needs a little tweaking?