Yes I have read it. The book received good press upon publication. Very well written and thoroughly researched (there's a vast list of those he interviewed dating back to 1975). It is solid text no illustrations whatsoever but told with accuracy and obvious affection.
Two years previously Miss UP published Sebastian's much shorter The Life & Music of B.B. King. Essentially a straightforward and succinctly told story of Bs "journey" from Mississippi to the Apollo and the Royal Albert Hall, London.
But I've digressed.