seattle outlet mall is less than 90 minutes from the border, depending on where you live in the LM, from coquitlam i could get to the border in about 20 minutes, from my friends place in surrey it was about 10 minutes
you can save when they are having sales, the markdowns can be really good even with the exchange, i find it worth it for a few things, a lot of us retailers won't ship some things to canada, nordstrom for instance i've wanted to get some shoes but they won't ship to addresses outside of the USA on particular styles, also chanel egoiste cologne is not available in canada but nordstrom carries it but won't ship it to canada

so there are some reasons to cross border shop, new balance selection in canada is awful compared to the states