I believe this is the busiest In-N-Out Burger in town, and we have several in Las Vegas. It's cool that they have a "secret menu". The bottom line is that the burgers here a very good but I had to deduct one star because they don't offer mayonnaise. I just don't get that! Maybe they think mayo is unhealthy but what are burgers and fries? haha
If you don't care about mayo, this is your place. A fairly simple menu (like the original McDonald's). They keep the place clean, too.
The one on Sahara is less busy but the same good food.