Ok, I had never looked at cyberhomes before, but often use Zillow (though not for values). Interesting that they disagree by $175,000 on the value of my current home. What precision!
I will note that you can not compare Zillow values before they made a change to the algorithim to those after. The change did not shift the values, just the “rules” for calculating them. It is like seeing a college on US News’s annual graduate school rankings slip 20 places after they change their methodology and concluding that something happened this past year at that school that made it 20 places worst than the prior year.