I just assumed I would love the GTS12 as much as I do the GTS11.....not so much.  I needed a half size larger in this shoe.  The construction is just so off and the material is so thick and abrasive.  The seams of the tongue rub against my foot.  The GTS11 was MUCH better constructed.  This shoes is so heavy and clunky and causes pains in areas a new shoe shouldnt.  I have a blister from where the shoe was rubbing where the seams on the sides are.  I decided going back to my GTS11 and plan to just buy another pair of those.  I DESPISE these new adrenaline's.....What happened?