I currently rent a property through these agents and am on my second 6 month tenancy agreement. I had absolutely no problem setting up any viewings or securing my property which is an achievement when you consider I did the whole proces in just a few days! I had no problems with collecting the keys either. My only slight complaint is that the admin fee which was £200 might be considered a bit expensive.
Apart from that the only issue I have had with them has been lack of communication regarding sorting out a slight damp issue in the second bedroom. This has however now been resolved and I wouldn't hesitate to use this company in the future.