Our local Neiman Marcus is a really nice one. I window shop here often but I rarely actually spend money on anything (okay, maybe a Balenciaga handbag every two years or so). Since I mostly shop in the handbag department here, that's where I'll focus my review.
This location is very nicely laid out and the employees have always treated me friendly and with the utmost courtesy. I was browsing the Balenciaga and Bottega Veneta sections just last week while wearing a pair of jeans, Chuck Taylor sneakers, a Captain America comic book t-shirt and a sweater from Wal-Mart, and still I was treated like a valued customer. I've never been given the "snobby treatment" here, and I really appreciate that. The salespeople never treat you like you can't afford something in their store (I can't say that about the nearby Saks).
The designer handbag section is divided into little mini stores by brand, making it super easy to shop by designer. The sales associates are pretty well educated on their products (now, they aren't as well versed as the sales associates at the Balenciaga store at Crystals, but they can answer basic questions).
Returns here are also a breeze. Nice, clean and spacious restrooms. Overall a really nice Neiman Marcus.