I actually don't like to get in sushi debates with friends. It usually ends with someone stomping off yelling something about shoving a hand roll in my face. People are VERY protective of "their" fave sushi spot. That being said, Kai (or at least its staff) introduced me to the world of sushi and they've never let me down.
Quick history lesson, Kai used to be a different sushi place entirely, located across from the Galleria. One day on our weekly voyage the owner told us they were closing and moving to Summerlin. We were elated since we lived over that way. A few months later we set out to search for the new location. All we knew was it was on Durango somewhere. Have you ever looked for a random sushi place on Durango? It's like saying, "I'm at PT's.". Impossible to find. Thankfully the owner called us and let us know their location and they were open!
The sushi is seriously so fresh and wonderful and they're willing to alter spice level or use soy paper for any of the rolls. They resisted the AYCE deal for a while but I'm glad they caved because it's worth every cent. My faves are the Moon Roll, Dynamite Roll and the Sue Roll. The green mussels are phenom and the baby tako is totally addicting. It's octopus, but don't be scared.
The service is great and they'll remember you if you go more than once. Their sister location is Sin City Sushi over on Eastern and Serene, same exact food and quality. YUM I'm starving now. :-)