Anyone who is committed enough to be doing 100 miles a week is likely to own several pairs of running shoes, thereby spreading the "workload" of each pair.

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ONLY THOSE WHO WILL RISK GOING TOO FAR CAN POSSIBLY FIND OUT HOW FAR THEY CAN GO.

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... Unfortunately, it's not always possible to rely on a particular model remaining in production for year after year. Even if the name stays the same, the actual shoes often undergo various changes that can result in them being markedly different from the shoe you first "fell in love with".
On more than one occasion, I've resorted to buying more than one pair of the same model in case it's going to be discontinued or "improved" in the coming months.

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ONLY THOSE WHO WILL RISK GOING TOO FAR CAN POSSIBLY FIND OUT HOW FAR THEY CAN GO.

very true... I run in Asics Gel Kayano's and they seem to bring out a new 'improved' kayano every 6months! Since joining a club though I can't see myself being able to afford running in Kayano's much longer

EDIT: How many times can you use 'Kayano' in a sentence? lol

That's a good point actually... I may have to get on to dorunning and order a few pair of my Brooks... gts 7 adrenaline something or other... they're SOOO much cheaper on there!!

just keep an eye out in the magazines, typically one shop who's cheapest for a particular shoe one month, won't be the next month!

There's an Asics gait analysis roadshow type thing doing the rounds at the moment. Have a look here http://www.techtours.co.uk/ to find if they're coming near you and get yourself booked in. It seems to be a non-sales (non commercial) event so hope it's ok to post the link.

Think it probably is a sales tour as they have been doing it for a couple of years, same as Nike, Adidas,Saucony etc.They will analyse you and give advice on what Asics shoe would be most suitable but you don't have to buy that shoe, it simply gives you information on what type of shoe suits you.
Used to work for another brand for a few years doing a similar thing, would always recommend a suitable shoe from that brand but realised that not everyone suits that brand so would suggest alternatives from other brands

Indeed, it's very mucha brand based thing... it was the asics techtours that made me the asics man I am today! There's no real pressure to buy though, they just very much push the one brand.

On a related note, after tuesdays soaking wet run my trainers still weren't dry today, so I had to use my old trainers (ones recommended to me from my gait analysis). I ran 2-3 mins quicker than I normally do on the same route with no noticeable increase in percieved effort, felt much more comfortable though I could feel myself striking with the heel more - I tried a few short sections of forefoot striking and I was near silent! My current trainers make me sound like i'm stubbing my feet on the ground if I strike with the forefoot... How bizzarre!

(by the way, i'm pretty sure a fair part of the speed increase is owing to the fact that i'm tapering, so feel a lot more resting and raring to get out and run!)

I'm booked in for next weekend. It should be interesting, I have 2 pairs of asics shoes, one for pronation and the other neutral. Both bought on informed advice from running shops. Not sure which ones I should be in. The pronantion ones make my hips ache, the neutral ones make my knees ache.

Perhaps you need something inbetween? On my latest trip to the running shop, I ran in 6 different pairs of shoes, 5 of which were for pronation, which from that, and previous, gait analysis I OBVIOUSLY overpronate quite a lot... but a couple of the shoes had TOO MUCH support, whilst others too little... in the end the ones I got were a perfect mid-ground... and thus far, still no complaints AT ALL

What I'm trying to say is that you need to run in the shoes aswell... walking in them is no good, so going to a shop with a treadmill is your best bet, because even a shop assistant can't tell you how they feel for YOU to run in.