Yep, I don't go to Costco often, but Mrs. Spicy knows to pick up a bag or two everytime she is there. They were on sale once ( I think like $2 off per bag) and I bought all 10 bags they had. You just can beat having a decent microfiber for that price.
I know I am a big Pakshak supporter, but in a pinch (on the road, at a car show) I have used these MF's lightly and gingerly with QD to remove bird droppings or other contaminants, with no micro marring induced. I'm not saying I would use them all the time on paint, but they aren't the swirl inducing monsters that lots of people make them out to be. They are all I use for wheels, doorjams, engine bays, and interiors.