My Adrenaline GTS X (2010 version of the Adrenaline) shoes finally wore out on me and needed to be replaced.  I, unfortunately, need support shoes for running, and went out on a limb and purchased the GTS 11 without trying them on, on the Internet.

I'm impressed.  They feel just as good as my GTS X shoes felt when they were knew, and confirmed my suspicions that they were, indeed, worn out.

I'm staying a year behind to save $40/pair, and it's working well for me so far!