For decades there seemed to be little information about the Yardbirds that was clear and reliable. Greg Russo's book helps to correct much of that. Maybe the best section has to do with the pre-Yardbirds activities of the founding members, and the band's history before Eric Clapton joined. Similarly, the pre-Yardbirds careers of Jeff Beck and Jimmy Page are well-treated. And for the real hard-core fans, Russo has assembled a very extensive discography, and almost impossibly, a list of all gigs from the first club dates to the last ones under the name "Yardbirds" by the band we know as Led Zeppelin.
The book has come in for some criticism for factual errors, and indeed there are a few, but the ones I noted were pretty minor and usually involved ancillary information. For me, there were other things that were more disappointing. Foremost was the hazy treatment of the replacement of Chris Dreja by John Paul Jones. It left me with a number of unanswered questions; too much of this transition is still unclear.
I thought the rather substantial sections on the post-Yardbirds careers of Clapton/Beck/Page were unnecessary, as they're documented much better elsewhere. But having that information about the other members (especially original lead guitarist Tony Topham) is a definite plus. The Box of Frogs and modern Yardbirds sections are welcome, too.
This book is a pretty quick read, and is probably the best available resource until/unless someone else (are you listening, Christopher Hjort?) decides to tackle this admittedly difficult band to chronicle.