I've never bought anything at NM except make-up. Too expensive, too trendy, and the sales people are downright snotty (with exceptions). If you're not dressed to the nines, you catch sneers from employees. However, I've had great luck with the Clinique counter. I usually prefer going to Sephora and letting them pamper me (they're so nice over there if you take the time to talk to them). The clothes at NM are too outrageous for me, and somehow it just doesn't feel welcoming. I feel like I'm walking through the pages of Glamour, Elle, Lucky, but with my rude aunt shadowing me to make sure I don't touch the leather or fondle the cashmere.
Pros: Designer lines, things you'd only see on runways
Cons: Snobby salespeople, expensive trends