I'm a casual runner.  I run 2 - 5 miles a few times per week.  I was rocking the Asics Gel Nimbus 12's for a while, and several iterations of the Gel Nimbus line before that.  I found them to be a great running shoe with great cushioning.  After running my last pair into the ground I headed down to Sport Authority to find some new shoes.  I tried on the Gel Nimbus 14 and found them to fit ok in the store.  They felt slightly weird, but I figured I would break them in.  Plus, the Gel Nimbus line had always treated me well, so I figured the new versions must be better than ever.  Wrong!  My stabilizer muscles started to cramp up on my first few runs.  I developed painful blisters on my arches.  Even after breaking them in for several weeks I started to blister around my toes.  I found these shoes to be much narrower in the toe box, have much less cushioning and be higher in the arches than the previous versions of the Gel Nimbus.  These shoes do not fit what I consider to be my pretty normal and typical feet.  I had wasted $130.  I went back to the Sport Authority, tried on several more pairs of shoes and settled on the Brooks Ghost 5.  I find the Ghost 5 to have appropriate cushioning and fit more like my beloved Asics Gel Nimbus 12.  I'm sure the Gel Nimbus 14 work for some people, but don't blindly "upgrade" from the previous models.