This was one of my favourite restaurants in Vegas, the wait in line was 15 to 20 mins, but it was well worth it.
We had the Hell's Kitchen Burger and Farm Burger, along with the Truffle Fries, all of which was recommended by our very friendly server. He also came to refill water constantly and was very hard working and organized.
Both burgers were tasty and different from others we've had before, the parm truffle fries were amazing and a large portion that's great for sharing. Dipping sauces were very good as well, not your regular garlic aioli and ketchup, it has some special flavour to it.
The fiery window display with the GR name is also a nice touch for tourists like ourselves to take photos with, nice interior inside as well.
Tip: go earlier if you are a group, wait could be over 30mins. For couples the line goes pretty fast and wait is not too bad.