Lots of great information on that site. I worry that too many people [based partly on Meathead's somewhat authoritative writing style] take it as gospel, though.
For example, in the equipment reviews they knock down basically every kamado grill except the Primo as being "incapable of two-zone cooking". Which, with a heat deflector [which is standard on the Kamado Joe and available for nearly every grill] is just flat out untrue. You can absolutely set up two-zone cooking. I do it all the freaking time.
Here is his page on the kamado in general, and you'll see what I mean:
Buying Guide To Kamado, Ceramic, Egg Smokers And Grills
He highlights the Primo as being much more capable. But you know what is true about the Primo XL? It's 24" wide. You know what's true about my Big Joe (or the BGE XL)? They're 24" wide. Yet he's going to make the claim that because it *looks* more oval, that somehow it's more capable of doing 2-zone cooking than an equally wide grill of a different shape? Somehow because my grill has MORE space than a Primo, at the very front and back of the grill, it can't do 2-zone?
I took him to task for this years ago, and he just doubles down and says it's not "true" 2-zone cooking while saying the Primo can do it.
So... While I applaud him and his site, and while it also gave me a great education into cooking, it's important to remember that he's not the sole authority.