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I don't know, I kind of like the 'N's.  Let's you know at a glance where Avrukh is departing from what's been played before and suggesting something of his own.   

I appreciate that in ordinary opening books, the author might say something in the text like "and here I suggest that White could have improved with . . ." without marking the new move with an 'N', but here, where there are new moves suggest in almost every line, I think it helps to do a bit more.

I have my copy, which is definitely an impressive achievement.  For those complaining about the length, consider how many books/pages you need to buy to have a 'complete' main line black repertoire.

As an aside, while both the author and publishers are justifiably proud, I must admit I do find the boasting about all the novelties to be a bit irritating especially the way they are all marked 'N'.  It reminds me a bit too much of certain less impressive books.

In any case, I've found a couple of places already where move orders seemed to have tripped them up a little.  More concretely, in the Catalan Benoni line, he gives Gelfand-Aronian which went:

1 d4 Nf6 2 c4 e6 3 g3 c5 4 d5 exd5 5 cxd5 b5 6 Nf3 d6 7 e4 a6 8 a4 b4

and here he mentions the game continued:

9 Bd3 g6 10 Nbd2 Bg7 11 Nc4 0-0 12 Bf4 Ne8 

with some analysis (and suggested improvement).  He then claims Gelfand should have played the "much stronger" Nbd2 which seems to force the black bishop to e7.  I wondered why, and the reason seems to be:

"9 Nbd2!N" g6 10 Nc4"!" Bg7 11 Bd3 0-0 12 Bf4 Ne8 

and stops here, which rather unfortunately is a direct transposition to Gelfand-Aronian.  So Nbd2 isn't much stronger unless it cuts out a good option for black which it doesn't seem to.

I doubt it is possible to avoid mistakes in a book this big though, and there is enough on Bd3 to allow you to play it so it's not a big deal.

This debate on how much theory a sub-2200 player should learn is a reoccurring theme on this board. I can understand someone being overwhelmed at these massive serial tomes. Personally, I intend to buy all three of Marin's series and have already bought both of Avrukh. One reason I enjoy Marin's opening books is that they read like far more than an opening book. There are chuck  full of middlegame instruction. Admittedly, Avrukh is a bit tougher to digest. 

I believe it was Aagaard who said you should only try to memorize the moves in bold in the GM books. To hell with that - even that is too much for my old brain!  But on the hand, I feel like the understanding I gain in the positions is enough for me to feel confident enough for OTB play at my level. And when playing back through the moves, I am more often than not able to find the right move. 

I am yet to win a game due to opening preparation where remembering a specific line mattered. However, I have won many games, where I simply understood the opening position and resulting middle-game better because of my study of the opening.

Most of the chessplayers I know spend far too much time on openings. Tactics, endgames and strategy (probably in that order) are far more important in terms of scoring points. 

When was the last time you won a game due to good opening preparation??

Anyway, I still see the point of 2000-2200 players getting these books. You learn a lot about all aspects about chess from reading them. Maybe dedicated books on tactics et c. are more worthwile. Perhaps briefer 1.c4 and 1.d4 repertoire books are "better" for the <2200 player. NCO (or similar), a database and an engine could be useful. I still like the good opening books.

Whoever said these lines aren't sharp hasn't played them.   

The lines give white a slight edge against perfect play. If you play less than perfectly as Black, you'll end up bleeding to death and not knowing you were even cut.  Avrukh's lines are designed for a player like Dreev to take advantage of the slightest slip and crush his opponent.   

I won't use Avrukh's every suggestion, but he answers many questions for me.   

If you want flashy lines that win in coffeehouses, these volumes may not be for you.  But if, like many of the Chess Pub players, you are around 2000-2200 and are looking for a way to maximise your points in serious competition, then these series (along with Marin's and possibly Aagard's), are must-read material depending on which flavor opening you prefer.   

So one has to learn more than 1000 pages only to play these openings with confidence?! Who´s the target audience, IMHO it´s impossible to work this through as an amateur, maybe even for semiprofs it´s too much and as a reference any database + engine is better.

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Yes very manageable indeed. But it must be remembered that this is a non confrontional repertoire which mostly tries for a very modest pull. If you wanted to take on e.g. the Botwinnik Slav, that would be an additional 1200 pages.