I have had my microfiber Ameribag for a couple of years now.  When it started looking a little sloppy after about two years, I tried replacing it with two other bags, both of which fell apart within two months so I've been using the ratty one again because it is in better shape than the others even after two plus years.  The construction is solid.  The first thing to break was one of the hooks on the inside.  I then discovered there was a better hook at the top!  The next thing was the patch of Velcro started coming unsewn, but it was more than a year before that even started happening.  It is still hanging in there, but is only half effective as a closure.
I washed it and it faded slightly, but still looked better than before I washed it.  It is a comfortable bag that stays put on your shoulder.  In short, it is well worth the money.  I have back and shoulder problems and this bag really distributed the weight comfortably.  I've been known to still my DSLR camera in my bag and it did a good job with that weight as well.  In fact, I'll probably start using it as a camera bag instead of a purse now.  I admit, I need a new one.
The x-small is larger than most purses I've carried in the past.  Great organization too.  Lots of compartments, zippered, and otherwise.  I love the sunglasses pocket on the end.