But it’s even older than Star Trek (see The Fly). Transporter gone wrong is an old trope. The book takes a different take, but it is essentially the same idea and the book adds very little to the exploration of “what is self?”
In my humble opinion I think it is an overly cavalier book until the last 10% (YES! 90% of it is padding!) when it FINALLY gets to its central thesis.
And it wasn’t a “Wow, I didn’t see that coming” as much as a “Wow, finally.”
Very disappointed.