Kellxx - sorry to butt in but I have to tell you that the reason first hand experience is not as good an indication as a scientific study is that the former is what is known as anecdotal evidence. Just because one person had a good experience or a bad one doesn't mean that another person will have the same.
Reputable scientific studies are far more reliable. Of course that doesn't stop someone else distorting the findings to suit themselves but that is beside the point.

