This is my absoulute favorite burger in the world! No other place can compare, not even a sit down restaurant. I already have a review at another In n Out, but again i will say that the best is when you take it to go. I say that because i highly recommend to ask for it to go in a box with a lid because it will trap the moisture in the box and the fries will become soft, that's how i personally like it because unfortunately the fries do become hard quick if you don't do this process.
This is the busiest location in Las Vegas. Since of course it right next to strip accross the strip. The longest i ever waited was 45 min to get my food after placing my order, but of course the line wrapped around all the tables in the restaurant. You'll run into tourists all the time that literally will get off the plane and drive straight here before even going to their hotel. And you'll always see taxis also with tourists. It's definately an adventure. The didning room is also slightly bigger due to how busy it gets.
Go try it!