I have mentioned online valuation systems such as Zillow and their Zestimates(R) before, but I often like to check my work against theirs just out of curiosity to see how they did. I took an example of a home I sold to see how they compared to the online valuations. This is a 2 bedroom condo at 1800 Wilson Blvd in Courthouse. The unit was listed for $615,000, sold in 5 days for about $5,000 over the Zillow estimate.
This is just one example of many over the past few years.
Trust your real estate agent! Experience, education, and research are always more valuable than an online computer generated value!