I'm using it the second time as I just can't stay off after a pretty short break xD
The endurance benefit is just amazing and I hate to say that but I already absolutely hate the times I'm not using GW.
Sadly I also got some sides.
I'm constantly really tired and light headed. I'm constantly really thirsty and hungry but not really motivated to cook.
I guess the sleepyness is related to the really low diastolic blood pressure I'm experiencing on GW.
Been using GW from PN at 20-30mg for aroung 10weeks the first run, and am now in week two the second run at 20mg, as 30mg is really hard to manage due to the sides. However if you drink enough and take enough minerals to replenish what you sweat out (and one really sweats a lot) cardio sessions are nothing less than phenomenal.