I'm a runner and I over-pronate.  I had Brooks Adrenaline GTS 15 and wore them way past their due date.  I wanted to stay in the Brooks Adrenaline line but I didn't want to spend $120 on the newest shoe, so I decided on these.  My shoe size is 8 and my feet are on the narrow side.  I was worried when I read other reviews that the shoe was a bit small and to order a half-size up because for some reason the 8.5 size is significantly more expensive than the 8.  So I took a chance and ordered the 8, which fit perfectly!  The colors were limited but I'm happy with the look I got.  These are definitely more flexible than my old GTS 15s, but not as stable in the arch (I guess you get one or the other).  They're very comfy and my feet are happy again on my runs.