Eh, it's OK. The prices on produce and bulk items are great; prices on other things are comparable to what you'll find elsewhere, and maybe even a little more if you're conscientious about shopping the sales when you shop elsewhere. As others have mentioned, they don't take credit cards, so make sure you have cash or a debit card when you go. Also, you have to bag your own groceries, so it's probably not the best place to go if you've got your hands full, say with a kid or two or more.
I never thought about the ambience of a grocery store, but the warehouse feel, weird layout, and lack of music made me appreciate how comfortable normal grocery stores are to shop in.