This doesn't seem to have it's own thread, although it has been mentioned in passing in a couple of others.
With 2 patties it comes in at 1/5 pound of meat, plus has lettuce, tomato, 'real' onion slices, and cheese. It is dressed with mayo. At $1.99 it is less than half the price of a Quarter Pounder with almost as much meat and (to me) better toppings. If you just have to have pickle they will put some on for you. Basically it is a McDouble deluxe at twice the price. Most of the time for me it's worth it, although I find the flavor is enhanced by the addition of ketchup, in which case it becomes a 'virtual whopper' (from that other place.) I usually get mine without cheese. Somehow asking for it with no cheese plus ketchup confuses them. I've taken to ordering it without cheese and asking for an extra ketchup packet when they give me the burger.
Path of least resistance.