Pros
The union, UFCW, provides standards for medical, pay, vacation time, etc.- as well as a few scheduling rules like requiring 10 hours between shifts. The company offers a good discount (15-30%), 2 weeks of vacation after 1 year, and a subsidized bus pass/ORCA program.
Cons
They are extremely customer centered, but seem to forget about employee morale. Inconsistent enforcement of rules, "clique-ish" environment, and it can be difficult or impossible to get the schedule or position you need. Managers tend to be condescending and curt. It's a high-end store, so many customers have extremely high expectations, are often rude, and seem to expect that you'll know what they want- without telling you. If a customer complains, you'll hear about it, even if it was an entirely illegitimate complaint.