Verdicts In...In-N-Out is still way better by a million times (in my opinion).
After the long lines have finally died down, I visited Shake Shake in West Hollywood and I'd say, it's worth trying! The line moves really fast and the portion size is small. I ordered the mushroom and cheeseburger and my sister ordered the chicken sandwich.
What's cool about Shake Shack is that they have many options for you. Lots of different shake flavors to choose from and also, they serve beer and wine! I'm not sure how well wine goes with burgers and fries, however it's always nice to have options in life. 😜