I was there earlier this year and it is a very nice mall, has a lot of stores which one would think would be only on upscale streets, like Madison Ave in NYC, Oak St in Chicago or Rodeo Drive in L.A.
Up until that point, I was always impressed (sizewise) by King of Prussia Mall outside of Philly, but South coast is defintely better.
The only thing I really didn't like is the department stores. Macys, Nordstroms, Sears and Robinsons May aren't exactly high-end dept. stores. There is a Saks there but that's about it. A Neimans or even a Bloomies would work well there....