I approached this with slight trepidation: you never know how these biographies are going to go. Some are whitewash jobs, whilst others don't give you the detail you crave.
I knew little of Hughes going into it: his aviation feats, his reclusiveness and his womanising.
The book unlocks all of these in great depth, and whilst it doesn't paint him in a great light, it gives an insight into his formative years which goes a long way to explain the results.
The salaciousness is dealt with fairly sensitively, and the sources are impeccable.
I found one thing slightly annoying: the book jumps around through eras as in analyses diffeent aspects of his life. I'd have preferred a much more linear approach, to weigh up achievements alongside failings, giving a more balanced view of the man at any given time.