Zillow says that there can be up to a 25% difference in their Zestimate. CMA's are based on actual sales, more accurate data from real estate professionals. In my personal life, I am developing the habit of differentiating between the carbs between a salad and a hamburger. The difference is 22 lbs in a month. The client believed that her property was worth a 400k. My CMA revealed that the property was worth 430l. When we listed it, we were under contract in a week for the full listed price with no improvements. I'm particularly effective with a new widow who wants to move to Florida who wants to be closer to her grandchildren. She knows that she still has value to give and she wants to give that to her family. What is the story your grandchildren ask to you tell over and over again.