Raku is excellent! I had their 10 course kaiseki. I called a few weeks in advance to make the reservation.
They sat us one of the private rooms. It was a nice change from the main dining room. The restaurant is nice and upscale but this is Vegas and there is no dress code so there are people wears shorts and slippers in addition to people in suits, etc.
I had an 8pm reservation and got there about 10 minutes early. They seated us right away.
The food was excellent as expected. It does take a long time to complete the meal since there is some waiting between courses. Usually the wait is between 5-10 minutes but it can be as long as 20 minutes so hopefully you have some good company.
The full meal of 10 courses + dessert took around 3.5 hours.
Service was also excellent. The waiter explained each dish in detail as they were presented to us.
My only minor complaint is that I am used to having a macha tea at the end of a nice kaiseki meal and it wasn't present here.
At $100/person for the 10 course, it's a great meal.