I'm originally from Hong Kong so I can tell you from personal experience that this is as authentic as you can get for a Hong Kong cafe style restaurant. The foods tasty too, but it's only good value if you're there for the lunchtime menu or the dim sum.
But, if you're in a business situation and want to dine some out of town guests...I'd recommend this for lunch or dinner without hesitation. They even have private dining rooms if you want them.