I am completely clean. I never have done any anabolics or hormone boosters....yet. ha.
I did do the 15s. I actually enjoyed them. I seemed to put on a good 3 pounds or so during that phase. And vascularity sckyrocketed during that time. My roommates also did HST. They enjoyed the 15s too. It can be quite the challenge though during the last few days.
I did an upper lower HST split though my second go around. The first time was MWF though.
Hope this helps. Ask more if you need it.