I had high hopes for Food Express after reading some of the "best chinese food in Vegas" reviews. But alas, I was disappointed by my visit. Out of the 4 dishes we ordered, 2 were hits, 1 was acceptable, and 1 was a miss (but the free soup was good).
My parents ordered this exotic dish, which my mom claimed was duck intestines in black bean sauce. I was skeptical but decided to give it a try. Much to my delight it was a hit. The other hit was the stir fried duw miu sprouts with abalonushrooms. The gravy was very tasty and the sprouts had the hot wok taste. The empress chicken was acceptable, but it seemed more like regular bak jam gai instead of empress chicken (gwei fei gai). The big disappointment was the beef in XO sauce. I could not taste the XO sauce at all and the beef was a pile of thinly sliced cheap meat, not like the tender little cubes of high quality meat used in a really good version of this dish.
This place is definitely HK style, with the fish tanks, spartan decor, and dirty bathrooms. Contrary to HK style, the service was surprisingly good. They were very attentive and changed our plates midway and ran over with napkins when my Dad spilled water. However, the service did taper off near the end and they were busy with the large number of customers rushing in.
The final sting came when we received our bill, which was $64 for the three of us including tip. This is on the high range of what I'd expect to pay for HK style cooking, maybe at a "high end" restaurant, without the word express in the name.
Best chinese food in Vegas? Possibly. Compared to what you can get in Sacramento, LA, or SF? Nope.