***This review is for the restaurant only***
This place is awesome! The pricing, menu, and service were all top notch. I tried the kobe surf & turf rolls and garlic mash for my meal...both were solid. I also had their strawberry cobbler for dessert and that was quite tasty too. Was it the best sushi in history - no. But when I take into account the total experience while at Koi, put it this way: when I visit Vegas again I'll go back to Koi. And the only place where I can ever make that emphatic of a statement in Vegas is a casino. If I had to give it a small dig, I would say it was a lil too dark inside. But that's minor; as I come for the food and good service.
By the way - all of the negative reviews you see (of the 1 to 2 star variety) are for the lounge/club that opens up later in the evening. I have no insight into how that works.