Great place for AYCE sushi. Usually AYCE sushi restaurants don't give great quality of sushi and slices. Sushi Mon offers good quality cuts for their all you can eat menu.
I've always been a fan of sushi mon. It became a must go whenever we're in vegas. Told all my friends about them too and most of them feel the same way. It's like a tradition now. If you still have room for desert, the plum ice cream is good too. They usually offer 4 selected special sushi pieces (you only get one order of each) offered at dinner prices, which is about 3-4 dollars more. I highly recommend doing that. Great customer services to boot.