The perennial question of these types of places is always ... is it worth the wait? I can't honestly judge this without a grain of salt having been to the original as well as many, many, multitudes of great taco places. However ...
That being said, if you're willing, interested, or just find the line not that intimidating, this is still the best place to get tacos in Las Vegas. The tacos come out piping hot and you will pretty much burn yourself trying to stuff that hot deliciousness in your mouth. Yeah I went there.
I recommend going not a peak time, whatever that is, and just be ready for a wait almost always!