I'm not new to property investment, so I feel my opinion is well grounded:
Foxtons here in London offers a fantastic service, backed by what seems to be a massive client-base -- on three separate occasions, over the last three years, when looking for properties to buy, Foxtons came through with properties matching my needs. I've even had them manage my properties for me, and all my tenants seem happy with the service so far.
I may have had reservations in the past, based on what I've read, but Foxtons appears to have "scrubbed up" since then; I'm more than happy to recommend Foxtons today!