I have read both Bugliosi's "Helter Skelter" and "Taming the Beast: Charles Manson's Life Behind Bars" by Edward George and found both of them quite enjoyable.

Having just read 'Manson In His Own Words' I have to say I enjoyed the book, although I have also read some pretty scathing reviews of it mainly saying that Manson in fact was either misquoted by Emmons or indeed that Emmons just made stuff up. Squeaky also was very sceptical. I read something by her to the effect that the book had elements of Charlie running through it but was mostly rubbish.