Earlier quoted context omitted.
I wanted redfin to work when we solf our house in the SF Bay area a few months ago. Redfin's issue is the selling agent was located 45 minutes away and just ran random comps and said our house was 120k lower then market. She said it would never sell for what I thought it was worth. So we ended up going with a local agent who put it on market for more then we thought and it sold for 1% over asking.
This happens with full price agents too. In my experience, their "expertise" is really just confidence and bluster. Commissions are high not because real estate salespeople are good, but because they are inefficient and because they operate under a de facto cartel.
I love their site for searching.