Bought my first pair of shoes for running (wouldn't call them running shoes) from JJB, when I told the guy I was running the Marathon he asked "how fars that then?"............. I know, I should have twigged then!
I ran a 10k in them....... well I say ran, more like hobbled! Then I joined the local running club and was guided to what I really needed............. a pub........ no! a proper running retailer.
I've e-mailed JJB (and just for interest CC'ed it to Trading Standards)telling them my story and what I think of their claim.
I often pop in to see if they've got any better and sometimes test them a little......... its cruel really, but fun!