I've only been here a few times, and I enjoyed a lot eating the ramen, I always order the Tonkotsu since it's the best one, according to my friends.
The ramen sure taste good, but the only bad thing is that it's too salty for me. The place is really small so it's really packed when it's busy. I like how I get to see the kitchen when eating :]
I think this is the best ramen place in Vegas, and I will always come here to eat ramen, but it's not the best in U.S. (I like the one in little tokyo more)