Nordstrom- LOVE their customer service, but since there are none near me, I'm just stuck with it online. Still like the store, but the online version just doesn't have as many higher-end designers and I get charged tax since there's a NR in my state.
NM- Sometimes can feel a bit pretentious, but always have a nice selection of items. Also stuck with just the online version, but at least it's tax-free.
Saks- Love the atmosphere and generally a good selection of items. Have never had any issues, but there is an off 5th in my state, so I do get charged sales tax...
Barney's- I've never had customer service issues, but they sometimes seem to have too obscure of a selection. Not many typical "premier designers." At least it's tax free and they have a nice Balenciaga selection.
Bloomingdales- Only the online version (tax-free) for me. I like the overall atmosphere, but I really wish they carried more high-end designers. I've been to the SF flagship numerous times and loved it and the luxury boutiques within.
Overall, the tax-free benefits can be nice when making a large purchase. Only issues are to buy with a department store, or from the boutique. If I buy from the boutique, at least I'll have perfect packaging and nice repair service. If I get it from a department store, there is usually a better return policy and sometimes GC rewards, but less nice packaging .