Some interesting stuff, but largely the usual BS you get from "authorized biographies." I think the authors made up a lot of it.
IMO: the only really good (and credible) Mob bios are:

"Little Man - Meyer Lansky and the Gangster Life" by Robert Lacey.
"Capone" by John Kobler.
"Capoe" by Laurence Bergreen.
"King of the Godfathers" [Massino] by Anthony M. Destefano

"A Man of Honor," Joe Bonanno's autobio, is well written (by a co-author) and interesting, but too self serving to be credible.