I am a Sephora fan and this one in the Miracle Mile shops is a nice one, although a bit crazy with foot traffic off the Strip and the mall.
It is light and bright with big windows at the front which is a nice feature since it is always nice to see colors in natural light. The selection is as good as any Sephora, although not as big as my regular store in Colorado. Still, there are lots of associates there to help & still enough products to paruse. They seem to do a lot of make-up applications at this one (or were the day I was there). The checkout was a little disorganized and people kept cutting in line and causing all kinds of nastiness - which the cashiers handled the best they could.
All in all a nice store and one you can lose yourself in for an hour or so :)