Finally decided to check this place out on recent layover in Vegas. Pho kim long is located right in the Chinatown area. It's very nice location with parking available. Parking can be difficult to come across, but it ain't too bad, especially during lunch area.
I always get the Combo pho dat biet wherever I go. It has beef balls, rare steak, beef brisket, tripe, etc... I love all the meats and soup broth was pretty good. Not terribly expensive, it cost like just under $9 bucks for the large. I didn't even know there was a small and large version. My girlfriend ordered the pho with just rare steak and it was a small size. We didn't specify which we wanted.
I would definitely come back for more, especially that it's open 24/7. Can't get better than that in Vegas.