I love this place. I guess I'm a little bias since we used the picture we bought as a Christmas card (great gift idea BTW). It's $15 entrance fee but if you have someone else with you they can buy the one for $35 and they get 2 free drinks and you can share.
We weren't able to last more than 15 minutes since it's literally -5*. But they do give you gloves, coats and some booties. The entire place is made of ice, the chairs tables even the bar where they mix the drinks.
It's worth checking out and they now have another one open at Monte Carlo.