I personally find *most* Juicy Couture stuff to be aimed at junior high school girls. When they are bright, sometimes obnoxious colors, have cutesy phrasings on the bags (everyone loves a Juicy girl, or things like that), and are made of terry cloth, then yes, I think they are juvenile and not very sophisticated. I too brand associate Juicy to their tracksuits, and sweatpants that say Juicy across the rear, so I don't think that one of their branding images is to be sophisticated and classic. I think it's meant to be a little tacky/gaudy, fun, and out there. The only Juicy bag I ever liked was all leather, and didn't have any obvious branding on it (like the one you linked to), but it was a very impractical pale pink and was $500, so I passed. However, I tend to not like bags that are too recognizable as a brand (I dislike logo/monogrammed bags in general), and if I had the money to spend on a bag, I would choose a hayden-harnett, or one from anthropologie.
Just my two cents.