They can help with athletic performance, alone. Even more when combined with anabolics.
I wouldn't trust any aerosol form of it. I know it is out there (and some life-extension clinics claim that it is effective), but you need to inject. All of the medical literature on GH and IGF are the injectable type.
They are banned substances for atheletes, but they are not testable. Only way you can get busted is if some doping agency raids your house and finds you in possesion of it (which has happened, quite frequently as of late).
Also they are expensive products. I wouldn't recommend them for your "I play sports" average guy. Unless you are a very good athelete to begin with (scholarship athelte or pro), I don't think that they will benefit greatly when weighing the cost and health risks.