I use it occasionally. Last few weeks of a blast or when I feel burnt out.
But I prefer Clomid 25-50mg EOD and Caber (sensitizes LH receptors if I recall). Even without Caber though, Clomid keeps the boys nice and full. Caber just makes it ridiculous.
I used to use HCG at least every 4 weeks... but i didn't use any for at least 7 months at one point and even then i got my wife pregnant... so I guess it depends on each person... now I am on L3 IGF1 and it works wonders