We recently bought a house through Property World and I would definitely recommend them. Kevin and Dan helped us negotiate fair price for the property and I found them to be genuine, helpful and honest (words I never thought I'd use to describe estate agents!) whenever we spoke. As soon as our offer was accepted, they took the property off their website immediately. Property World kept us informed during the purchasing process without bombarding us with unnecessary phone calls. They were always contactable and returned calls quickly when required.
I would use Property World again if we were to ever sell the house.