Have you been advised to have gait analysis by a physio/etc? Visiting a shoe shop is alot like visiting an opticians, they'll try thier damndest to sell you something even if you don't need it. Make sure you really do need whatever it is your looking for before splashing out on some £100+ fancy restrictive pillows for your feet.
I think it's the Army mentality that makes me think that too Zoe, it's a rare person that can't cover 26 miles with no time limit, but if you push yourself to your own limits (wherever those limits are) then you are worth the praise.
Whilst I totally agree with the above statement, that achievements are all relative to the achiever and one mans success is anothers failure, I am loath to find myself supporting the modern PC crowd that pats everyone on the back and congratulates them all equally just for competing. (Thinking of the whole 'there's no winners or losers' crap infesting school sports days if you believe some reports).
If an 80 year old with arthiritis hobbles round in 6 hours, that's an achievement in my book. If you're a healthy 30 year old that knew months in advance of the marathon and shuffles round in 5 hours then I'm not going to even shake your hand. Some people need to wake up and bin this 'everyone's a winner' crap. Life only gives you what you stand up and work for.
*phew* Got out the wrong side of the bed this morning I think.
Try it during a training run and see how you go. Might be a bit heavy mid-race but you never know. I love the stuff, although reading all this makes me realise just how long it's been since I've had any! Must correct the situation...