I kinda figured it was a "tax" thing. For 15 years I wore crap disposables. Why. I'm on track now! Thank you SF Gents!
Just be aware that there is a chance that you'll get taxed when you receive them in the US. Moreover, sometimes shipping companies have "handling fees" that can be pretty significant. Note that this is in general of buying shoes from overseas and not anything specific to Nick.
From my experience, my dealings with Nick have been nothing but superb. There are only a handful of people with Nick's level of customer service.