I go there a lot, but mostly for food in the area (Cheesecake Factory). There's a lot of stores, definitely, but some repeats, and just different variants of the same thing. However, it is very good if you have something in mind. They will most definitely have it somewhere in that behemoth of a mall.
it's the only place near Phila that has LV, Hermes, NM, and other smaller high-end stores. So you have to shop there. Weekdays are best, or early on weekends. When it first opened there were hours long traffic jams just to get in around Christmas. While it is mobbed, I don't find traffic bad if I go early.