Expensive, but very good. And really, you're in the Wynn, so what else do you expect?
The Acai Kiwi Smash is DELICIOUS, so much so that after I had one on my first night of my trip, I just had to sneak another in before I left.
The place is very nicely decorated, lots of mood lighting, comfy chairs and couches, and friendly staff. Even though I only ordered one drink the waitress was attentive to see if I wanted anything else, without making me feel pushed to order more or get out.
I wouldn't want to drink there all night unless someone else was paying, but it would be a great place to have a splurge cocktail before heading out.