All I know of the "history" of the JL is that it's from Minnesota. This Wikipedia article details more of the Who Did It First debate. None of that really concerns me. What I wanted to discover when I decided to try out this inside-out cheeseburger was if it lived up to the hype. Answer: Yes...ish.
The truth is, whether you put your cheese inside or on top of your burger, you're getting cheese and beef between two buns and that's always going to be pretty awesome. The joy of hamburgers, for me at least, has always been in the toppings and condiments. Regardless, it's something to try. And it's dinner on the table.
Start with your beef. Do what you do with your hamburgers: salt, pepper, etc, and form into patties.