It's pretty well understood what this can do. There is no real chance of some horrible long term effects. Any such one in a million case will matter far less than Covid.
Look into HOW IT'S MADE. They've NEVER done anything like this before!
I know how it is made. It is a great new way to easily produce vaccines. It has no way to cause the problems some people imagine. Science is not magic. The outcome and a not random.