Although I've only recently begun to read up on performance studies, it seems to me that Auslander has chosen a particularly illustrative case study in glam rock. Within a genre so explicitly focused on the construction and performance of identity, it's actually a bit surprising that this book hadn't already been written.
While Auslander comes from the performance studies tradition, Performing Glam Rock also serves as a great overview of the genre. The book includes a great deal of history, making it a worthwhile read for anyone interested in the genre. The big guns are profiled in depth to illustrate the glam's traits: Bolan (style), Bowie (theatricality), Roxy Music (gender) and Suzi Quatro (more gender, specifically female masculinity).
Overall, an accessible and compelling read.