I've gone here a few times over the years on various trips to Las Vegas. It is one of my favorite sushi places. I've never had bad service; the wait staff have always been very friendly, helpful, and accommodating.
The food I've had has always been really fresh, using quality ingredients. They even had stuff flown in straight from Japan on special when I visited last.
The location inside the Flamingo is a bit hard to find, and their hours of operation are a bit lame given the city it's in, but worth a trip if you're in the area.