I don't know but he got it backwards. Shorter esters will clear faster and won't yield as high of a blood level as longer esters. I know, I ran 100mg/day of tren acetate and was fine. Mad pumps, great strength, but tolerable. That is 700mg/week. I tried tren enanthate at 600mg/week, and by week 4, I could barely lift I got so pumped. I couldn't train back, legs, barely even arms, I had to cut it out completely. 400/week or less is about the most I can handle. Now, he is right in that acetate is a shorter ester, so the actual amount of raw tren is higher per mg of tren ace than it is in tren enth... but in real life, the build-up effect of the longer ester more than compensates. That's why most guys see more water retention with test enth or cyp than test prop, the build-up allows higher blood levels of test, which leads to more conversion to estrogen. Back to the point, if you're using tren ace or tren enth, both will yield about the same results. Tren ace should be shot ED or EOD, tren enth 2x per week.