i guess its down to the purity of the product. same thing happened to me but with different brands. in my case i felt brawn's epistane product was way way weaker than ol's epistane, despite taking the same dose mg for mg. ol's seemed to be the real deal so i stuck with that, but i only found this out after switching to ol epistane so initially i thought epistane was bull. not so after using the ol product.
i guess when it comes to PHs and hormones, its best to go with trusted brands and spend the extra buck to be on the safe side. i tried to save some money and hopped on a deal a site was running but ended up getting a bunk product. always question why stuff is on sale!!!
ive only heard good things about havoc by the way. i guess you cant go wrong with that