Im trying to gather my memory here, but, unfortunately, when we ate at STACK, it was at the end of a week long business trade show and a half dozen cocktails. It's sketchy BUT:
I split a 46 oz steak with my coworker.
I had gourmet donut holes (holy hell were they good).
The waiters fold your napkin when you get up to go the bathroom.
Food is great, interior is beautiful, expensive as hell. That about wraps it up. Everything I'd expect from Vegas.