like all boots, the leather requires a light amount of initial breaking in. but, after that they feel very comfortable to me...
i wear a size 8 mens nike and sketchers. so, i ordered a size 8 for the Vega sport boots, and they fit spot on... i wanted to wear thick socks to cover my shins for comfort. so i broke them in and always wear a pair of thin, low cut white crew socks as a base plus a pair of wool snowboarding socks. but, they'll fit fine with just one layer of socks too...
as mentioned, my only negative thus far is that the toe sliders do wear out. but, they're only like $8 or so a set. so, i just ordered some extra. they unscrew/ screw on with just a philips screw driver.
i think jon kerr has the same ones, so hopefully he'll sound in a bit on this as well...