I like Cheng's a lot.
We order delivery a couple of times a month at least, and the food has always been good.
Nothing spectacular, or above average...its really hard to find outstanding Chinese food in Las Vegas, but this always seems to satisfy my cravings.
My favorite are the cream cheese wontons, and the Orange Beef.
I also really enjoy their Moo Goo Gai Pan.
The service is always very nice, and sometimes, they through in some free "donut" desserts for us.
I've been to the location 3 or 4 times, and I've always found it very clean, the the woman at the counter is great.
Their delivery driver is very courteous as well.