This is a good book, but not a great book. The annotations are not the usual annotations given between moves (evaluating better/worse options), but rather they are a short story or description delivered in typical Bronstein style before the moves of the game are listed. Which is fine if that is what you want. They are quite entertaining, and encourage adventurous and imaginative play. One of the best parts of this book for me was the 'Characteristic Aims For All Positions Of An Open Type' given just before examples of the 'Queen's Attack' and the 'Bishop's Attack'. He gives 13 Aims for White, and opposes with 13 Aims for Black. As an example for White: 1. the attack on KB7; 2 to control the QB4-KB7 diagonal. And for Black: 1. the defence of KB2; 2. to challenge control of the K3-QB5 diagonal. If you can't make sense of these then you aren't ready for this book. If these points appear useful to you, you should see the other 11 (W & B) Aims. If these Aims are painfully obvious to you and you like Bronstein's approach then you will probably get a lot more out of his stories than I can.
I would say this book would be very useful to someone who had played, say, 50 or so open games using different openings, who still wanted to keep playing open games, who didn't want to have different lines presented for exploring or memorisation, and who would enjoy Bronstein's undoubted skills in recounting interesting events and exploring adventurous chess.
Most of the games are King's Gambit (24?) and Ruy Lopez (about 140ish) - which was what I wanted. I was really looking forward to getting this book, then I was disappointed because I felt it wasn't helping me learn. I felt it was too slow. Now, having a bit more experience, I get real pleasure from this book and find Bronstein's approach helps buck me up when my enthusiasm for chess seems to be waning.
This book does NOT use algebraic notation (1. e4 e5), but uses the older descriptive notation (1. P-K4 P-K4).