I've been to the one in Plano, and it's awesome!! We drive out there once every other month and stock up. There is a Whole Foods directly across the street, that we hit the same time. We get:
Sunflower seed butter
Frozen potstickers
Frozen veggies
Cereal
Yogurt
Bread
Quick kid's snacks (We got all out "special" snacks here. They have tubs of cookies in shapes that are really low in sugar, and only have a few ingredients.)
They have great prices on thibns like organic spaghetti sauce, salsa, and other sauces
Nitrate free lunchmeat
You have to get their "silver dollar pancakes!" They are frozen boxes of mini pancakes for $1.99. They are so good, and have only the ingredients it takes to make pancakes. They are also organic. My son LOVES these on mornings we are in a big hurry. He asks for them a lot.
I hear great things about their $3 wine, but I don't drink.
**I actually think they have GREAT prices for certain things. The things are listed are much cheaper there, then even Kroger or Walmart. One thing I will mention, is I never buy their produce or meat. The meat doesn't look all that great, and the prices aren't either. I got some produce once, because I was there. It didn't last even a few days, and it wasn't really cheaper. I like the produce at Sprouts better, and their meat is priced better also. Of course, there really exotic stuff is kind of expensive, but it is everywhere else.
ETA: Oh, their customer service is THE best. I have never been to a store that is run so well.