My wrists are 6.5 (though for some reason my right wrist is bigger at almost 7 inches--I think my left has been squished from wearing my straps too tight over the years). Anyway -- I thought it was going to be much bigger than it was until I tried it on. The rest is history.
It's much thinner than I thought too, and lighter. I never have problems banging it into doorways, like I did with my 312, which was sort of top heavy, though smaller.