Zara is like the Neiman's of "fast fashion"....generally I think of the fast fashion hierarchy as such:
-Forever 21 = Target/Walmart
-H&M = Nordstrom
-Zara = Neiman's
Anyway this location has a great men's section on the second floor. Here you can find suits to socks to shoes and everything in between. I think the sizing runs small but maybe it's the idea that Americans are more zaftig and plump than our Euro friends. For example some of the blazers fit me better in XL while some of the tees that fitted me were Medium or Large. Of course you should try everything on so you can be assured that fitting parallels your expectations.
I'm not sure about the women's selection downstairs but I am satisfied with everything I purchased on my jaunt to Vegas.
Customer service was so-so as I was left to browse but when I actually needed help the associates were quick to pull stuff from the back or offer assist me in the dressing rooms.
Of course with such affordable clothes I couldn't resist.