I love the shoe.  I am a Brooks fan.  This is my first pair of Adrenaline.  I have been wearing Ravenna for several years.  I wear orthotics and I am not sure the fit is perfect but part of that is because my podiatrist wants me to wear a larger shoe.  I think the orthotic may be slightly smaller in the 9 than in the 8.5.  All in all, the shoe is lightweight, cushioned well, has more stability than the Ravenna.  I can wear them for at least 10 hours and then the arch begins to hurt a little---but I am sure that is the orthotic.