I own a pair of Mudclaws and Terrocs, but I've also tried on various other shoes in the line. They are, for the most part sized correctly at the heel but far too small in the toebox, IMO.
I tend to buy them a half size bigger so that my toes won't squeeze too badly and live with the fact that they are too loose at the heel.
But that just might be my feet, of course. Every person has an optimal shoe brand based on the design compromises that each brand makes.
That's why I never order shoes via Internet anymore. I go to several full-service places and try on many sizes and brands before I buy.
Of course, not everyone has that option. The alternative is to buy and send back a lot of shoes -- a hassle, no doubt, but worth it in the long run if you have no other alternative.