That is pretty much what I have read about the subject of HGH. I think it would be very helpful for riders like domestics, or guys like Cadel, Alberto, Cancellera, Vino etc. who actually race many races at threshold or above.
For others like Menchov, Schleck jr., Sastre who are event trainers, I would think that their bodies with the help of dieticians, MDs personal trainers could develop all the HGH they need without outide artificial boosts.
Among the rich in Los Angeles, HGH is used commonly. It is very popular among film stars, high profile attorneys, salesmen, middle aged women and men who really want to look and feel their best.
I do not think there are negative health effects.
I totally disagree with the posters here who have pointed out prominent facial and cranial changes in Bonds and Armstrong I do not think that effect is true.
I do not think a distinct facial change is an effect with HGH.