Cryonics is one of those things that's hard to evaluate. On the face of it, it seems insane. You're essentially making a bet that someone will find something useful to do with a frozen brain -- and that your estate will be able to afford the procedure -- before the company you've entrusted your brain to either makes a mistake or collapses. Given the near-total lack of progress on the former front (there's been consid…
Isn't it still the Star Trek Transporter problem? The future may be able to revive a copy of you, that thinks it is you, but you'd still be dead.
Even more starkly: ever had surgery? Ever taken benzos? Or been black out drunk? I could give you an amnesic med, like midazolam (often used in surgery) then tell you that you were absolutely certain to die. And I'd be right (again for whatever flimsy values we're using here). The version of you that is hearing me tell you these things will disappear from earth. You'll wake up in the morning, none the wiser.
Edit: Only scary part is staying conscious after the cutover. Greg Egan gets into some of this with excellent short stories in Axiomatic (The Jewel) and Luminous (Transition Dreams). But that's still not really much worse than benzos.