I spent a couple of years running in Brooks Adrenaline GTS on the road, but recently needed some trail shoes. My cousin recommended Adidas Kanadias, so after a try on session I went for them.
For my running there doesn't appear to be any difference in speed or comfort between the support shoe and the non-supporting shoe. Which either suggests the shop got it wrong in the first place, or as my leg muscles have developed over the last couple of year from non-running, to marathoner, I no longer need the support.
When these Adrenlines wear out, I'll switch to the Brooks Defyance to see if the theory proves out, as they're basically a neutral version of the Adrenaline.
Edited: 04/10/2012 at 18:53