Sounds great on paper, but in reality all they do is take photographs and stick them on Rightmove and Zoopla. Their valuations are based on others in the area (you can check that yourself using Rightmove to see what has sold), and usually they let you decide (they gave me a range of between £120 and £130K). But the killer is, when you feel they're doing nothing for you, and want to sack them after 3 months without a viewing, you can't, well not without paying them in FULL. May sound cheap, but there's a reason for that.