So far, cryonics looks like a great SF idea. One of those things that should be possible in theory, but may not be possible in practice. If you get frozen now, what I think will happen is that they'll do it wrong, and the people who thaw you will do it wrong, too. And those people will learn about what to avoid next time they thaw someone, and what the people who froze you should have done differently.

That's great, because it'll help people they freeze in 2215 to maybe have a real chance of being revived, so I'd be prepared to volunteer for it (but not pay a lot of money for it). But what if they succeed partially, and I don't just die (for real, this time) but end up a 'vegetable'? No, thanks, I'm not as altruistic as all that.