oi vey, every time this issue comes up, the knives come out for my man
Ralphie.  First off, the book was published in '65, the same year GM
finally redesigned the new IRS rear suspension, so the handling problems
were effectively resolved by then.  Second, there were already 100 lawsuits
against GM regarding the handling of Corvairs when Ralph put pen to paper,
so he didn't fabricate this issue.  His book was about the automotive
industry, not just GM or the Corvair, and his industry critiques directly
led to many safety improvement that I doubt any of us would prefer not to
have for our loved one's vehicles.  I happen to be a fan of the '64 <
Corvairs, and consider them to be one of the only Merkin cars I'd ever
bother to own.

--
Casey