Oh my goodness. I think I drool everytime I go into this mall. I'm not a mall girl by any means, I much prefer independent boutiques for my shopping. My hometown is home to the biggest mall east of the Mississippi (Palisades Center in NY) and I lived down the street from the Copley Mall in Boston for 6 years. The Scottsdale Fashion Square blows them both away.
If you can't find what you're looking for there it probably doesn't exist. It has everything you could want from your standard mall like the Gap to luxury flagship stores like Louis Vuitton to wonderful department stores like Nordstrom. Its big, its clean, and it never feels crowded. There are a ton of restaurant options which is nice because the food court is rather meager.
There is a ton of free parking which is fantastic; I'm used to paying $8 to park at Copley. The layout of the mall is a bit odd and we definitely had to wander around a bit to find where we parked our car. I have to say that I didn't feel that I needed to dress up there at all, but even if you do feel the need its on par with other huge shopping centers elsewhere. (South Coast Plaza in the OC, Copley or Newbury in Boston...)
This very well may be the first mall I start to frequent regularly.