This is a cute fashion park that has a decent variety of stores and is outdoors. The only thing is that if you really take a closer look, the stores aren't super useful and mostly for show. I find that the Scottsdale Fashion Mall is better for actual shopping where as Biltmore is just fancy looking and probably better for strolling about.
Everything inside is lit up at night, but closes early ... so basically you can stroll around, go to Macy's, or eat.
I went to visit the lululemon here, and actually it was quite extensive. One of the larger lululemon stores I have been to. Overall, lots of parking, confusing to get out of, and great if you're in a bind for something you forgot.