Johnny tats, you can't compare ptren and tren, to test c and test e. Test e and c both have the ester cleaved away to leave you with the active compound testosterone whereas ptren and tren are separate active compounds with separate active metabolites, but in my opinion, Ptren works. I didn't feel any different but I did start packing on lbs very quickly. I was surprised and I really am puzzled as to the mechanism of action. My buddy had similar results. The only con I seen was taking it three times daily. It becomes a pain in the ass.