As everyone else has pretty much already said, the book contains superb coverage of most of the greatest guitarists and their guitars. Every time I turned the page, I would find myself smiling as another one popped up that I had hoped to see. Excellent photos and just-enough info on each one. If the author decides to release another edition, I suggest a few possible additions:
First, no surprise that the author included several of arguably the greatest guitar of all time - the legendary '58-'60 Gibson Les Paul Standard 'Burst.' The good news is there are 'Burst' photos of Michael Bloomfield, Billy Gibbons, Eric Clapton, Mark Knopfler, and Peter Green (which was later owned by Gary Moore), but there were a number of omissions including perhaps the most famous 'Burst' - Jimmy Page's '59 (which was previously owned by Joe Walsh). I'd include a classic shot of Jimmy playing it with his violin bow. Although Keith Richards is already in the book for his Tele, he's credited as being the first star to play a 'Burst,' so why not mention it in his section and include a good photo? (Mick Taylor ended up with it next). There were numerous other stars who at one point in time played a 'Burst' e.g. Jeff Beck, Don Felder, Joe Perry, Steve Lukather, Martin Barre, etc. I understand you can't include them all and therefore you have to draw a line somewhere, but I would suggest adding the following dedicated 'Burst' players to the book: Paul Kossoff, Duane Allman, Gary Rossington, and Joe Bonamassa. That's quite a list of star power who played that amazing guitar. Yes, that's a lot of Bursts, but the book is about star guitars, so might as well include the best of the best.
Naturally Jimi Hendrix is already included in the book, but I would add a photo of him & his famous psychedelic Flying V which he personally painted and made into a one-of-a-kind work of art.
Not sure why the author chose to include Prince's Hohner Telecaster-copy. It's a nice guitar, but I still remember my jaw dropping when I saw his "Cloud" guitar which first showed up in the movie "Purple Rain." That is a beautiful one-of-a-kind custom guitar and would be my preference over the Hohner, along with his strange Prince-symbol-shaped guitar.
Finally, I would recommend a few others to consider adding: Randy Rhoads and his polka-dot Flying V, Paul Stanley & his iconic Iceman, Ace Frehley & his three-pickup Sunburst Les Paul, and Alex Lifeson & Geddy Lee (and their dueling double-necks). If there's any room left, I'd add Steve Howe, and possibly Marc Bolan & Tommy Bolin.
Overall, it's a fantastically enjoyable book for the guitar/guitarist aficionado.