For our purposes it would mainly be used when coming off cycle to help with fertility (ie...trying to get pregnant).
per Dante (I hope he doesn't mind and maybe he will chime in), he suggests the stack of the following for fertility purposes:
repronex
hcg
tamoxifen
and if he can hack it (clomid)
IMO, for PCT purposes HCG is cheaper. The primary difference is HMG contains LH and FSH compared to HCG containing only LH.