Unlike most people, I have more success with transformation files than I do with other files, like training files. I listened to CurseThumbsucker for several months. While I do not have any of the infantile traits when I sleep, the trigger phase that regresses me works perfectly. I almost immediatly lose all control of myself and become a baby.
As an experiment, I decided to try a transformation file I wasn't really gungho on, just to see if it was just me tricking myself, so I downloaded XGirlTime and ran it. Even though I was interrupted a couple minutes before the end of the file (by a phone call), when I tried the trigger an hour or so later, it worked. I tried both five years old and fourteen years old, and I became both of those. It was only a mental transformation, I didn't actually hallucinate, but even so for only listening to the file once, I felt it was pretty cool.