This.

I think Chambers has some pluses and considerable minuses.   The pluses - it’s comprehensive as far ans official recordings go and he mines a lot of secondary sources. However, he has serious blind spots / cluelessness on Miles’s music starting in the mid 1960s that get worse and worse the later you go.  His coverage of the electric era is mostly a waste (except to get a flavor of how that music went over many jazz listeners’ heads).  There are also some discography errors that suggest he wasn’t a close listener. I also think it’s unfortunate that he didn’t do any primary research when nearly all the musicians who played with Miles were still alive.  None of the other, better biographers had that luxury. I think Carr’s bio is better, as is Tingen’s.  I haven’t read Szwed’s yet!