I have been spending quite a bit of time with this book lately, and I have to say I'm really enjoying it.
I have been wrestling with the Lopez for a number of years, not entirely successfully, but I find it very interesting. Sometimes I try the main lines, and sometimes I retreat and play the Slopez (Qe2 Worrall or 5. d3 vs everything).
What I like about this book it is the great verbal explanations. I'm looking at the notes on pages 81-82 in a mainline Chigorin game where Neil McDonald first gives a depressingly long list of all the things in the position that favour black, then goes on to explain why white is still a bit better, and then explains Topolov's plan. I can fish games out of a database, or flick on an engine, but it's this sort of explanation that I'm wanting from a book, especially from an opening so rich in plans and nuances.
The book is essentially an ambitious repertoire for White in the Ruy Lopez, which covers early d3 plans to get you on board, and the full blown mainlines, including taking on the Berlin endgame and the Marshall gambit. For the latter, after pointing out the issues White has in winning the resulting pawn up endgames, he also gives the h3 anti-marshall as another option. That's what I've used myself after seeing it in Opening for White According to Anand.
Anyway, much still for me to peruse in the book, but so far I rate it