Marc's sells a lot of really good stuff here for really cheap prices. However, while they have many categories of items, they're limited in their selection. For example, they'll have product X, but only have one option for picking it out. The produce here is pretty terrible and old-looking.
The biggest downside is that they don't take credit cards. You have to pay with cash, in-state checks, or Discover. I don't plan on really grocery shopping here; it's not worth it to save a total of $3 with the inconvenience of going elsewhere to get other quality foods.