I'll ask Martin to comment on this as well, Mr. Spengemann, but the design of this system was deliberately structured in such a way to make it effective but as unobtrusive as possible. When personal identification needs to be done, it does not add a new layer of activity. It simply uses the existing activity for a dual purpose.
You always show your passport to get your boarding pass, which automatically records the information at that point, or, if you're going through a land border, you show your passport to the American officer on the other side. That one act, which is already what you have to do to cross the border, is all that's required. Then either the airline manifest is shared with CBSA so they can record the activity, or the American officers return it to the CBSA automatically and electronically. So the structure of this is designed to be as seamless as possible, and the traveller should not notice any difference.
Martin, on the inspection of goods, could you add a comment in terms of whether that has the potential to slow things at the border?