Quaint springs to me, I was asked to speak, lots, in California. Not sure they were bothered about what I said, just to hear the accent. Had the "London" thing too, and was quite amazed some of them had heard of Shropshire, got sheep mentioned a fair bit!
Shock when I was asked to describe in a gym class what we wore for PE back home and gasps when I got to the skirt bit!?!
Oh and I met some people who thought James Bond was real and whether we have afternoon tea every afternoon :)
Didn't hear any negative impressions there. New York nobody really notices as so many tourists. A lot of my brother's inlaws probably got it out the way with my brother before they met us :)
One weird one was in a Starbucks in Toronto, the nice guy serving asked if he could guess where my accent was from, was waiting for the unoriginal England/Britain... and he said West Midlands. I was quite astounded, I hadn't lived there for over 10 years and didn't have a strong Shropshire accent anyway, especially since living in places with far stronger accents!