I read an advance copy of the book; I liked it a lot. I think it’s worth reading even if you’re well familiar with the overall argument.
I think there’s often been a problem, in discussing something for ~20 years, that the material is all ‘out there somewhere’ but unless you’ve been reading thru all of it, it’s hard to have it in one spot. I think this book is good at presenting a unified story, and not getting bogged down in handling too many objections to not read smoothly or quickly. (Hopefully, the linked online discussions will manage to cover the remaining space in a more appropriately non-sequential fashion.)
I only like the first one more than the current cover, and I think then not by all that much. I do think this is the sort of thing that’s relatively easy to focus group / get data on, and the right strategy is probably something that appeals to airport book buyers instead of LessWrongers.