This is hands down my favorite cookbook in my large collection.
The great thing about Test Kitchen cookbooks is that they do a lot of trial and error and testing to ensure that they've got a solid recipe on their hands. Everything is well explained, and they give good reason why the failed variations of recipes didn't work.
While it is a great cookbook, it's not perfect.
The photos are black and white, so if you're used to glossy photos of food, you're out of luck here.
The layout and structuring of the numbered lists also leaves a lot to be desired. The layout seems to value saving paper (this is one thick tome already) as opposed to presenting a clear and easily read recipe. The layout is a multi-column, text-dense layout, with multiple sentences/instructions per numbered step.
I prefer more whitespace and that unrelated items get their own numbered step. If you're in the middle of following a recipe and going back and forth to the book, you don't want have to re-skim a list to figure out where you were last only to miss a step.
Flaws aside, they are annoying but not deal breakers. This book was the gateway for me buying many of the other Test Kitchen cookbooks.