The relative comparison is important.
Compared to most fast food (McD's, Burger King, etc), they're very good.
But In-N-Out, which I do eat, isn't as good as the burger I had at BLT (Mirage).
Of course, I paid something like $22 for the burger, fries and shake at BLT and I could have had just as much at In-N-Out for less than $10.
So, to answer "is it that good" -- the answer is probably no. It's not going to be some extra-ordinary burger. It's a excellent fast food burger.
None are located on the Strip. The closest, as mentioned is on the other side of the freeway (I-15) on Tropicana. It's not that much of a walk -- though walking on the overpass doesn't feel all that safe.