IMO, better to expect the worst and be pleasantly surprised, than to not know what you could be in for.
How many Canadians have you seen posting on VJ totally insensed because they've been denied entry to the US and they figured it never ever happened, because afterall, they're Canadian, and should have special privledges?
Over the years, I've seen more than a few.
No, it doesn't negatively affect your visa application, but it does put quite a crimp in a relationship.


