We have been involved with a few estate agents in Walthamstow over the last couple of years and none of them were particularly good. We had our Warner flat valued by three agents, and Churchill's quote was in the middle and we felt they seemed ok (in retrospect their valuation was probably a little high but we did get a good price for our flat because of it).
Our main contact was Alex, and I would highly recommend dealing with him if you can. He is friendly, gives good advice about all aspects of selling a property and he worked closely with us to make sure we got the best price for our flat. Towards the end we also dealt with Kim, who was also good - efficient, always called back and gave us practical advice about getting the sale through.
The flat didn't sell after a couple of months, but they gave us really good advice on making a few cheap cosmetic changes which really made a difference. They managed to get a lot of people through the door for viewings all the time - and seemed to do a good job of showing people round. We got honest and fair feedback from them on the viewing. Often the viewings were at very short notice, but as we wanted to sell the flat quickly we didn't mind this.
We also looked for a house through them, and ended up buying one through them. They took on board our requirements as buyers - which a lot of other agents didn't - and were honest before a viewing about the standard of a property.So we didn't feel like they were wasting our time and we did the majority of viewings with them. They were also good at keeping in touch with us as buyers and letting us know when something suitable came on the market.
So I would recommend them if you are buying or selling as one of the better agents in the area.