All you can you sushi made to order in Vegas. Very fresh sushi in the middle of the desert believe it or not. For around $25/person you get a wide variety of fresh sushi and side dishes. The restaurant was not too big but we came for lunch on Sunday so we didn't have to wait, I heard it gets crowded at peak times. My favorite are definitely all the nigiri and they don't give you a huge piece of rice as filler. There are a couple of high end more expensive items on the menu that you can only have one order per person. I say take full advantage and order it all because they were all very delicious; Uni, sweet shrimp, cajun salmon, amberjack, and yellowtail collar.
We stuffed our face and proud of it. All you can ask for in Sushi are freshness and variety and SushiMon satisfy both. Only downside, it is located about 20min drive from the main strip and if you do not have a car, it's not worth it to taxi out there.