Perhaps we were just unlucky but our experience with Davisons Weoley Castle, was a rollercoaster to say the least!
One reason why we went with Davisons is their cross-the-board positive reviews across a raft of different web sites. Moreover being fairly local to us it meant we could keep in contact with them face to face, should the need arise.
To be fair to Davisons our house sale did fall within the given time-span of a typical house sale - which for us was around 3 months from offer to exchange; and some of the delays were caused by the buyer's third party - something of which Davisons had no influence over. But I think the main cause of concern for us was the lack of voluntary communication from their side. Instead we had to regularly phone or email for updates (not on a daily basis, but at least weekly); and even then some of the information was a bit ambiguous and not all that reassuring.
They do have an online tracking widget (at a cost to you of £6), which covers the main steps of the legal sale process, but even now - almost 2 weeks after Completion - it is still incomplete with many steps at the "processing" stage!
All told, we managed to complete on the allotted date, and both parties were content with that. Davisons did their best for both buyer and seller, but I think more solid communication would be welcomed.