I wear a 10 but ordered up a half size to 10.5 after the first pair felt too snug, especially the width.  Asics quality is definately not what it used to be and although it fits fine now, the arch support is not wonderful.  And that's exactly why you buy Asics - for the support and stabilization.  For $100+ I will be looking for another go-to brand.  Very sad that I am looking elsewhere after being a faithful customer after 20+ years.