Some of them go fairly deep. I think they are supposed to be for 2200+ Jacob Aagaard (the head of Quality Chess) says you can just look at the bold moves to get the main ideas. Chess Stars might be best, they are very good at presenting the material, and the analysis is fairly strong.
Grandmaster Repertoire QC
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quality chess books are excellent. I think best in the business. Some I understand word for word. Others I don't grasp the concept.
Interesting comment about 2200+. I would hardly put my level so high on some of these volumes
The Negi book mentioned is one of the best on the market. For example, there is an WGM on this site, quite active in US tournaments, who found at least two of her opponents had prepared using it, and she was busted in the opening against them. So it don't like this one, wouldn't bother with the GM rep books in general.
Well, I study openings a lot and I have used a correspondence database where the players use engines. I found some forced draws in Negi's lines that were also tested by correspondence players. So against a well-prepared opponent, they will likely do things similar to what I have, they will study the book and they can find some of the flaws. Trying to memorize these books is hard. I have the Semi-Slav GM repertoire and Nakamura has played some lines that are not included in it. So if you use the GM repertoire, you still need to keep up to date on the opening especially if it sharp and risky.
I am 1900 rated, should I use these GM Repertoire books? I got them and read them, but say for example Negi's 1.e4 vs French Caro-Kann and Philidor, I understand it fine, but don't have the patience to do it.