Hk40hp..... nah... it's not nearly as bad as pgf2a. Well... it's not as intense. The pain lasts a lot longer. Pgf2a hits for 2 hours... this soreness is for 2 days, but isn't as bad. Feels sorta like you got a great workout.
Just shot biceps today. Feels good.
You should try it.
Shoot me an email, or IM me when you can.