Excellent biography, especially regarding the early years and the Ziggy Stardust period (roughly the halfway point). From the 80s onward, details become more scarce. I agree with other reviewers in that sometimes Spitz lets the fanboy side intrude a bit too much, but on the other hand this gives the book a touch of personal involvement.
I read this in a poor Brazilian Portuguese translation, with errors mainly due to the translator's lack of familiarity with the subject and sometimes even general knowledge - for instance, treating the West End as a city, rather than as a part of London.