But regarding the reader being able to vicariously experience the Lamb show through the recollections of those who were on "the fringe", I don't think that you can get better than the many bootlegs out there, most of which seem to paint a much more generous picture of how well the album was received than the members of the band would have us believe.
... than all members of the band would have us believe... those sodding five detractors of their own work.
Anyway, you may be right if you are only after the sound. For the sound and the stage show you would better turn to re-stagings of The Lamb by The Musical Box. And where would you go to hear about the roadie's experience or the memories of the album art designers...?
The book is worth having, though perhaps not quite for the amount I paid. It does not do the trick all on its own, but neither does Holm-Hudson's book.
As I realize that this is a debate I'm having with my own review once removed, as it were, I begin to doubt the point of the debate.