Be prepared to walk. A. Lot.
AZ Mills is by far the largest mall I've visited thus far. It is gi-nor-mous. Make sure you take special note of where you parked and try to get a spot near streetlamps if it's evening/night. Why? Well, I've noticed less-than-desirable wanna-be hardcore thugs infiltrating this mall since 2000. Bad news bears. :(
Majority of the retailers are "outlet prices" but be sure you do a quick price check, as some stores try to pull a fast one by inflating original prices and marking them down to "true" price. It's ugly, but it does happen.
There are SO many stores here, that your head will spin. It's overwhelming, I know, but I break the entire mall into manageable chunks. It's near impossible to truly shop the entire mall in an afternoon. Again, the mall is just huge.
I like that Mills has so many food options also.
Bottom line: shop here only if you're in a good mood and ready to bob-n-weave through crowds of shoppers.