Pros: Holsteins is a nice looking burger joint in a very nice hotel (Cosmopolitan of Las Vegas). The prices are reasonable, the service attentive, the drink menu extensive, and the servers attractive.
Cons: My burger was not quite what I had expected. I got the Korean Bulgogi burger that comes with a fried egg and kim chi. Sounds epic right? Turns out that the patty was drenched in some type of sweet teriyaki sauce, which I was not particularly fond of. Also, the prospect of Duck Fat Fries was presented to us. Sounds epic too right? Its more or less just a gimmick that resulted in overly hard fries with no extra flavor whatsoever. All in all, a decent filling meal with fresh ingredients and a nice atmosphere, but not THE best burger joint I have ever tried. I would go back to sample another burger because my friends did enjoy theirs (they got the "Gold Standard burger.)"