I use them a lot, but never tried to from Canada.
Decent prices on most stuff and really nice that they have so much available. Mostly I get hardware and materials that I either plain can't find elsewhere or can't find in small quantity. Yes price may be a tad high on some stuff, but when the other guys will only sell you way more than you need McMaster is a good choice.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-