This place gets packed both inside and through the drive thru, which is pretty typical of most In-N-Out locations. You'll just want to be super careful where you park because you might having trouble getting out because of the line of cars behind you.
The burgers have always been tasty and their prices are super cheap. When I'm trying to eat low carb, the double-doubles protein style are definitely a great option. Their fries are pretty decent if you're going to eat them right away (they get cold fast), and their shakes are pretty tasty.