The update thing... I think that's Canada Post wide, not just Purolator. I won't complain too much though - I like the delivery speeds I get from Canada Post/Purolator. USPS on the other hand... amazingly horrible tacking! I won't do UPS/FedEx from the US because of brokerage fees - I will do USPS, but only for items I can wait for, and won't have an anxiety attack over if there's no tracking. FedEx/UPS within Canada - I usually still don't use them, because of having to be there to receive shipments, but yeah, the tracking is usually a lot better!
Is this your first build? You probably said, but I don't remember.