Made hamburgers, which I usually grind myself (kind of a disgusting hassle), and instead tried Costco's styrofoam pack 'ground beef'. Normally, I don't buy 'ground beef', since it can contain all kinds of body parts, but I figured that it would be safe here.
I tell you what: IMO, that's some high quality stuff. I could tell from looking at it that it was almost all pink, not that much 'white flecks' (fat) in it. Some might want to see a lot of white, but I find that the burgers shrink ridiculously when the ground meat has a lot of fat. It didn't have the 'look' of what you'd get if they're throwing a lot of lowgrade trim into the grinder.
How did it cook: I used a panade, hard to tell if it helps a lot. Seems like it lead to an easily falling apart, almost meatloaf texture, but they did stay moist even cooked until gray (if I grind myself, I'm fine with 130-140 range, if it's pre-ground meat, I'm apt to take it a bit higher). The burgers didn't shrink very much at all, and didn't seem overly fatty.
For the next ones, I may skip the panade and season more on the outside of the patty, but overall I was impressed with the lean-ness. I had pondered getting their packaged 'organic ground beef' but it actually looked like it had more fat than I like.
The package has about 5lbs of meat at $2.99/lb, only used about a third of it and it made quite a few burgers.