I'm confused. Is it Zen Curry Express or Curry Zen? Oh well. I go here every trip to Las Vegas. And although a friend is the manager, I'm going to give you an unbiased opinion of Zen Curry Express.
Let me talk about the curry. Why? Because that's why we're all going there, so I might as well just get straight to the point. The curry is typical of Japanese curry. Very flavorful and thick. They give you different spice level options from nothing to lava hot. Of course, you'll pay a little more for a spicier curry.
I always order the chicken katsu curry, fried gyoza, Shirakiku ramune drink and if they have it this curry pastry thing (it's pretty tasty. It's kinda like an India samosa). I've been here about 4 times and I've never been disappointed. The food is good. The prices are good. The service is excellent. Parking is ample and I leave with a full stomach.
Good job guys!