Maybe I don't hear "about" as "aboot" as I tend to pronounce "route" as "root" rather than "rout". I take it Americans pronounce "process" as "praw-cess" rather than "pro-cess"? I've never caught on "sorry" so what's the difference? I love how Americans pronounce "nuclear", or at least how the now more-popular pronunciation has caught on as it isn't either of the Merriam-Webster dictionary's two pronunciations.

I think "eh" is quite common out west but it depends on who you are talking to and where. I'd venture to guess those who are higher in socio-economic class and strata don't use it too much unless they're talking down in social situations. You may not hear it much in Vancouver but I'd venture to say you'll hear it used quite a bit in pubs in the Fraser valley.