Just a point of clarification: pure MDMA (what is used in the study) is often very different from "E", "Ecstasy", and other street preparations. The party drug formulations are often pressed into pills and contain other things (on purpose, to give a different effect). It's often MDA, methamphetamine, cocaine, caffeine[0].
Consider this difference when comparing personal experience or anecdata about pressed pills (or impure "molly") to what they're using here.
0: e.g. https://www.drugsdata.org/search.php?substance1=2012&substan...