I discovered the patties at Costco a several months ago and have been buying them on a regular basis. They keep very well in both the freezer and refrigerator, which helps make them last longer. Nonetheless, I must buy 2 packages a month. I put them on the grill and then eat them plain. They don't need condiments or other additions - they are great as the dish by themselves.
On a side note, I introduced them to my mother-in-law and she started buying them, too. She is a picky eater, so this is probably the better endorsement than anything else I could say.