My reasoning for not taking it is three-fold. First, development was rushed. There could be months long or year long side affects we just don't know about, an error due to the development pressure, corners cut. Second, I don't need it. I'll be fine, I'm a young male with no health issues and a solid mind. I'm at the bottom of the list because I'm likely holding the lowest chance of a bad case of Covid- let someone else take it, someone who is in danger. If your family member is in reasonably good health, saving a dose for someone who is in more danger than them could be good. Third, there will likely be a standardization at some point that most people will get, if you want it just wait till then.