I went here for lunch on the opening week at Cosmopolitan. It's on the same floor as some other restaurants but seems to get more business than the others; we had a 20 minute wait. Once we were seated, we noticed that there were a lot of empty tables in the restaurant; I'm guessing that they're a little understaffed.
I had the Gold Standard cheeseburger, which comes with sirloin beef, bacon, sliced goat cheese, arugula, tomato confit, and a garlic aioli. The burger was quite good. The ingredients tasted fresh and the meat was cooked perfectly. Unlike a lot of gourmet cheeseburgers I've had, the grill taste isn't overly aggressive here. The bacon definitely made an impact and the arugula, while mostly dominated by the other ingredients, added a nice crunch to cut the grease.
I upgraded my fries order to the duck fat fries. It was my first time trying duck fat fries, but I wasn't impressed. I was hoping to taste some duck in there! They were definitely crunchier than the standard fry, but the steak fries here are very tasty as well and I would recommend those instead. I also had the Campfire Smores spiked milkshake, which was delicious. Very creamy and chocolatey, but for a spiked milkshake it was perhaps too smooth.
In conclusion: This is one of the better gourmet cheeseburgers I've had in Las Vegas so far. Stick with the steak fries unless you're curious about the duck fat or really like your fries crunchy.