FWI, I'm considering cryonics and one thing that has set off warning bells is how bad the CI and Alcor websites are (CI is much worse of the two).
If you do sign up, your next job is to help fix the many organisational and publicity problems cryonics has, let alone the technological ones. Cryoptimism (1 2) is an antipattern.
Cryonics deeply needs strong advocates who apply scepticism to it. I'd love cryonics to work, both technologically and organisationally. At present it does neither. I think it really needs the second even before the first, as the second is achievable right now.
I recently found something that may be of concern to some of the readers here.
On her blog, Melody Maxim, former employee of Suspended Animation, provider of "standby services" for Cryonics Institute customers, describes several examples of gross incompetence in providing those services. Specifically, spending large amounts of money on designing and manufacturing novel perfusion equipment when cheaper, more effective devices that could be adapted to serve their purposes already existed, hiring laymen to perform difficult medical procedures who then botched them, and even finding themselves unable to get their equipment loaded onto a plane because it exceeded the weight limit.
An excerpt from one of her posts, "Why I Believe Cryonics Should Be Regulated":