I've been to Sam Woo in NYC, Toronto, LA and Orange County.  This one in Vegas is by far the worst.  The bbq meats and the meals are a significant notch below the others  I've had bbq pork which was really dry, and I was surprised they served it.  The best bbq offering is the stewed pork stomach.  At the other Sam Woo's, my favorite dish to order is the salted fish and chicken fried rice.  However in this location, there didn't seem to have any salted fish flavor.  The beef chow fun is lacking in beef.  And to top it off, the place is not as clean as the others.  I've gone here around 7-8 times, hoping that things would be improved, but I have moved on to other chinese restaurants as there are simply too many other options in Chinatown.