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I have both the NB 623s and Reebok Zigs. To me, the biggest difference is that the Zigs are appreciably lighter than the NBs. Although I have a wide foot, I found no difference in how the two fit across the balls of my feet, but I did need half-size larger Zigs.
I've worn the NBs for two seasons and the Zigs for one, so I can't comment about their respective durability.
I don't know anything about the other two shoes.
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