Bought three Costco products and tried them.
1) el petite francais par baked bread (mini-baguettes)- cooked in oven per directions (actually on the outside grill with indirect heat) and they turned out very good. It's great to know that you can get some truly crusty baguettes any time you want, instead of the local supermarkets in the area, which think that molding their wonder-bread dough into long sticks makes it French...
2) Del Real Carnitas - did NOT follow directions, (which were to leave the meat in the plastic bag, puncture and nuke...), but braised with a little water in the oven (grill), and this turned out delicious. It's somewhat on the bland side, but that's better than being too salty, which is where most prepared foods go. We had plenty of garlicky black beans, rice cooked in chicken broth, and condiments, including Cholula sauce, so our big overstuffed burritos (more like burros, I think) were quite good with this meat. It is a conglomeration of cheap, fatty cuts - which is exactly as it should be.
3) Queseria Caribe Queso Blanco - tried to grate and make into Queso Fundidor with some Chorizo... this cheese is so salty, it's inedible, as far as I'm concerned. Use less, I suppose - but given that it's a mild cheese, why bother? Does anybody have any suggestions for this salty cheese? If not, I'm tossing it - what a waste - but I can't think of anything edible that could be made from it.