A downside that I haven't seen much attention paid to, although it does get mentioned from time to time, is the problem of having the organisation that has the care of your corpsicle surviving long enough, and taking good enough care. You can't freeze a social structure and put it in a vat for a century -- it has to live through all the time that you don't. What are the chances?

There's a flip side to that, which is that a cryonicist who takes the idea of reanimation seriously must also take the idea of future stability more seriously. Unlike any other living person they have reason to anticipate the long-term results of today's political stances, investments, and social developments in terms of actual sensory experiences. I'm not sure if this actually translates to increased rationality, but seems like should.