I'm 5'9", 155, and I need significant motion control for my flat feet.  The shoes fit true to size, I wear a 10.5 and these fit me in a 10.5.  I'm not sure what the problem exactly is, but somehow the bottom of this shoe rubs the arches of my flat feet, and i get blisters on runs over 6 miles.  The cushioning is OK at best, but they are stable.  I'd say they would work better for a big guy with some arches than they do for skinny guys with flat feet.  Too stable, not enough cushioning. Other shoes I've had (and these shoe's replacements) place the support a little farther back in the shoe, so you can feel it just in front of the heel.  So not a horrible shoe, just didn't work for me.