I just started using it a few days ago.
I'm in the process of using HMG + HCG at the moment to kick start my tadpole factory back in to life, and reverse atrophy after coming off TRT. Soon after I took the first HMG injection, I felt an aching in my testicles, which I took to mean they were firing back into life.
HMG has massively increased the amount of ejaculate I produce within just a few days.
I know PeakT mentioned this in one of his articles, but HMG has given me a "full" feeling down below, which definitely increases my libido. If you ever abstained from orgasm for more than a week when you were younger, you got that "blue ball" feeling and an urge to do something about it. It has given me that.