Been twice. Two stars for quality cocktails. Five stars in fact. Minus those stars for mediocre service.
If I'm sitting at the bar, paying $40 for two drinks, I'd like a bartender who is interested in my presence. The two behind the bar were far more interested in their crew, and were disdainful of my attempt to engage them in a discussion on drinks - which is why I'm willing to pay this much FOR a drink in the first place.
The space is cool, the spirits great, but I can make great drinks at home too, and have better conversations by myself.
The cocktail lab is pretty cool as well.