Brooks recently released Adrenaline 12. Although this is still a great shoe for the narrow, shallow foot http://drshoe.wordpress.com/2011/11/17/determining-proper-shoe-fit-width-and-depth/. There are some changes to the lower part of the shoe which warrants mention. My video below identifies the changes.
Associated posts include:
http://drshoe.wordpress.com/2009/11/05/shoe-review-brooks-adrenaline-gts-10/
http://drshoe.wordpress.com/2009/02/04/shoe-review-brooks-adrenaline-gts-8-vs-gts-9/
http://drshoe.wordpress.com/2008/01/03/shoe-review-brooks-adrenaline/
http://drshoe.wordpress.com/2008/09/17/footbed-design/
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This video is informative and accurate. Brooks has completely reconstructed and reshaped the Adrenaline, most noticeable changes can be seen between version 10 and version 12 I think. For my foot, which is deeper and moderately wide, the 12 is an ideal fit! After almost 2 years of wearing a single pair of the 10s, my pinky toe was busting out of the mesh along the lateral border of the upper and I had completely worn out the tread along the bottom. In comparison of versions 10 and 12, I found that I had more heal slippage with the 10 because the heel counter is shorter and the upper is overall much much shallower than the 12. With my 3/4 length orthotics comfortably placed on top of the sock liner in the 12, I am held almost 50% better in the than I was in the 10. Despite the discrepancy in the cardboard last, I think Brooks Adrenaline 12 far surpasses many shoes being sold now, you just need to have a medium, slightly inverted triangle or rectangular foot.