After I ran my estimates, I concluded that cryonics raised my odds of living to ~90 years old by approximately 5% absolute, from 50% to 55%. It's not very much, but that 5% was enough for me to justify signing up.

I think the most important part is to be honest about the fact that cryonics is a fairly expensive safety net largely consisting of holes. There are many unknowns, it relies on nonexistent technology, and in many scenarios you may become permanently dead before you can be frozen. That said, it does increase your odds of long term survivability.