I'm afraid I don't have enough knowledge of them to give any opinion that's worth anything.
My personal thought was that I didn't want to be first for any and to let the immediate problems come to light. It looks like there haven't been any massively adverse events so I'm just waiting on my turn now. Obviously long term effects aren't quantified because they can't be but generally problems are pretty quick to show with these things (large molecule therapies as opposed to drugs).