The price tag is $5.29 for one.
Shake Shack just recently opened in Los Angeles and even though I arrived shortly after opening in the middle of the week, there was already a line out the door (one that grew to spill onto the sidewalk by the time I got my food and sat down).
The lettuce and tomatoes were fresh and of good quality but didn't offer much crispness. The cheese was nicely melted for that creamy, familiar flavor from childhood.
The potato bun was pillowy soft and a little too soft for my liking. There wasn't much resilience to it so that when I held it, it squished down with a flimsy feeling. Still, the softness was nice and, to its credit, it didn't fall apart or turn soggy. They buttered and griddled the bun but I didn't really pick up any toasty crunch when eating.
Overall, Shake Shack's ShackBurger was excellent. I liked the simplicity and the beef was especially good--maybe the best I've had from a chain and particularly striking with its nuanced beefiness. It could use a little bit more crunch though; either from lettuce, toasting, or searing.
I would definitely get the burger again (but maybe when they open up a closer location--it took a little less than an hour to get there with L.A. traffic) but might skip the fries.
In case you're wondering, if I had to pick between the two, I'd pick a Double Double from In-N-Out over the ShackBurger.