I think you just described the supplement industry as a whole. "How much of which does what to whom and to what degree?" Very hard to measure since there are so many variables including what else is being taken (like AAS) that may overshadow the results. I think personal experience and anecdotal evidence is about all you can rely on past the science and the studies. Some will get greater results than others. I really figured that guys our age would benefit more than the 20somethings, since our GH levels are going to be probably 1/2 of theirs.
General well-being, yes. If fatloss is a side-effect, then great. Kind of my same stance with the TRT. I want to feel the best I can. The better I feel, the more productive I will be and the more enjoyment in life I can experience. If it helps with the old man pains, then even better.