Definately get more than one pair if you like them!! My husband had a pair of Mizunos that he loved and has been on the search for that same one since because the newer models changed it up enough that they don't feel the same.
As far as size--my feet have gotten larger and I am now 1-1/2 times larger for running shoes than when I started. I could get by with a smaller shoe, but I really hate my toes touching during my long runs.
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