I went here twice during my stay and got: the I-80 burger, the lamb burger, the buffalo fries and the sweet potato fries. I liked both burgers but they are very different from each other - so it really depends on what you're in the mood for, but the I-80 burger was "classic" to me - had all the basic components I want in a burger. It was satisfying and delicious, the lamb burger was equally as good but the lamb option and the accompanying sauce gave it a more sophisticated taste (and possibly healthier?) in either event, I thoroughly enjoyed. The sweet potato fries were good, I wasn't a fan of the buffalo fries though, it was too much going on for a side dish.
One think I wish I tried were the milkshakes - but I discovered there's one in NYC, so I feel like a pit stop there is in my future.
Overall it's great - and a very good mid-priced option in the Mirage.