I've always heard the hype about this NY staple, but honestly was never that intrigued to try it.
But since it was in Vegas and so was I the opportunity was seized. Really like the design both inside & outside. It's themed and branded throughout. I also was very impressed with the various vendors that were featured inside on the video screens. It shows a commitment to high quality and local vendors.
Now for the burgers. Let's use context. As the East Coast competitor to In & Out I'd say it tastes better. But before all you West Coast people start hating, here's why: the ingredients are better, but it's also more expensive so In & Out is a much better deal. I think you can get a 4x4 and In & Out for the same price as a Double Shack. But also the different kinds of custards and the cheese fries look amazing. So based on value In & Out blows this place away, but sheerly on taste Shack Burger wins. Not only are the patties bigger and have better quality meat, but the buns are softer and compliment the burger better.
Next time I want to get the cheese fries and try a shake. I wouldn't put this place in a gourmet burger category yet, but after tasting it I actually don't think it's a competitor of In & Out.
If you love burgers like I do it's worth a try.