Being from California, I've been going to In-N-Out for years. Their employees are always the best fast food employees in the business. The reason? My guess is they get the best because they pay nearly 40% more than other fast food joints (on average)!
The secret menu and super secret menu make ordering more fun. I always order hot peppers with my food and shhh... you can order some, too. I also have enjoyed fries made crispy and unsalted and I have also ordered my fries animal style. The biggest burger you can get now is a 4 x 4, but I remember back in the day someone ordering an 8 x 8 and even hearing of someone even getting a 20 x 20.
This particular location has always had exceptionally cheerful employees.
The orientation of the building to the parking lot makes it hard to get to the drive thru during busy times. Of course, this is a problem with a lot of In-N-Out restaurants.
The only other comment I have is that I hate ketchup dispensers and always order the packets. On my last visit I found a hair stuck to the spout of the dispenser. It's just gross to see a hair just waving at you when you're pumping out your condiments.
In-N-Out may not be the best burger, but it is definitely leagues ahead of most of the other chains.