Brooks recently released Adrenaline 12. Although this is still a great shoe for the narrow, shallow foot https://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:
https://drshoe.wordpress.com/2009/11/05/shoe-review-brooks-adrenaline-gts-10/
https://drshoe.wordpress.com/2009/02/04/shoe-review-brooks-adrenaline-gts-8-vs-gts-9/
https://drshoe.wordpress.com/2008/01/03/shoe-review-brooks-adrenaline/
https://drshoe.wordpress.com/2008/09/17/footbed-design/
Dr. Jenny Sanders Shoe Blog 
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.
I have been wearing Brooks Adrenaline’s since 2008 (when I started running). I wear a 10.5 2E, up until the 12 the shoe has been great, I mainly liked how well my custom orthotics fit into the shoe. Starting with the 12, I noticed 2 major differences. First was in the cushioning, when I would change out shoes mid marathon training season I would notice a HUGE difference with previous models (cushion support makes the running sensation feel like you were running on clouds, when compared the shoes with 3-400 miles on them). With the 12, first time I ran in them, it felt like the foam was more compressed and worn out (even though they were brand new). The second and the reason I am not going to have to purchase a different brand of shoe, is my left foot, no matter how lose I tie the shoe, I feel pressure on the upper portion of my foot, which makes me believe that my orthotic is not sitting normally, or the walls of the shoe have gotten a bit more curved than in the 11. Last sunday I completed marathon #4 in the Adrenaline 12s, and for the first time ever the top of my left foot felt like someone hit it with a hammer (fortunately ice and aleve helped me remedy it).
I think having a problem of my own with my right foot, I always find it hard to look for shoes that provides not only comfort when I run but also good quality that will last a long time. This review of Brooks Adrenaline makes me reconsider my previous choices.
Just picked up a pair of the GTS 12’s, glad to see they had a 4E width, I have a wide foot.
THANKS – i just bought the 2170 but will be returning it tomorrow!!
Great information–but video’s are not a very efficient way to get information (i.e., greatly prefer normal write-ups)
Thanks for your input Jason. I’ll be sure to give equal time to write-ups as well as videos from now on.
-Dr. Shoe