I recently visited a specialist running shop in Manchester, they were hopeless. Despite requesting an apraisal of my foot shape & running style the shop attendants encouraged me to buy a pair of cheap shoes, unaware of my weekly milage, weight or biomechanics. (I'm sure I would be crippled by now if I had heeded there advice!)
I have trusted runners world recommends in the past & have not been let down, however it is essential you know your foot shape & cushioning requirements.
I hope that my experience is not common, I'm tempted to name & shame, perhaps runners world could do a undercover investigation into the standard of advice from the top specialist running shops.