I have one and it's great! I use it when I go to the farmer's market and for lugging stuff to and from work in the Spring/Summer. Fits my laptop perfectly!
ALSO, it's a great bag to take to the Beach.....I stash magazines, books, bottled water, my plastic baggy with beachy things inside (lotion, lip gloss....). It's great!
It's *really* popular in Tokyo. I remember walking around Ginza on holiday and seeing all these posh ladies with small, medium and large Fourretouts! I've only seen a few here in NYC. I think the Garden Party is a bit more popular here for a carryall.