Gotta say, while I'm mildly interested in what made the cut (and am also guilty of being a collector of absurdly expensive free jazz records), I'm not sure what the purpose of a book like this is other than as a "flex." The title deems these as 100 "essential" recordings, but the majority are almost certainly going to be prohibitively expensive, collector-chased items and not anything practical for someone interested in the actual history of the music. I can see some argument for it being a NWW-list-type guide for future enthusiasts who don't care about acquiring OG copies of things, but at the end of the day this feels more like boast from the authors than anything truly in service of the music.
(And if you actually are a collector and don't already own these records, prepare for it to stay that way...🤑)