As I've already said I took a faor few of the orginal early 90's snowballs so i know what a good dose of MDA is like, I pretty much stoppd taking pillls in 2000 so can't comment on many others but the snowballs IME where th only ons I eveer had that where pure MDA, certainly at any high dose anyway.
For lots of you ravers who had no exerpinace of phycadelics they wrere just way to much, runours cercuulated abuut them being adulturated and people didntg like the comedown...then the chemical factort in Lithuanian got closed down and that was the end of those.
MDMA is a much easier drug to take on mind and body and poeple would also take many more of them in one evening that they would a string MDA pill so I believe there was deliberate swtich to MDMA, you can even hear it in the change of musical style, I mean even if you had another snowball in you pocket to take you#d probably not remeber you'd got it until 6 hours after taking the first, I could drop MDMA tabs (good ones) every couple of hours no problems...simple economics. Prices of pills didnt start dropping till much later.