I have to come down on the side of the 90's tabs being much stronger. You could take half of a speckled wafer and after you puked be floored for 5 hours. Tolerance wasnt an issue back then even for the folks who I was partying with who had started dropping in the mid 80's before mdma was scheduled.
Tolerance - I used to take 1/2 a pill at random nights, maybe few times a year. I got the same rush every time. 1st = 3rd = 5th roll. The first time I took ecstasy was a 1/2 Dove in a house party, I was the only one dancing lolz! But when I took 1/2 in a club shortly after, that was better and more intense.
When I did clubbing 4 weeks in a row (circa 1994), I found the rush wasn't quite as intense on the way up BUT I was more comfortable with it as it was a bit overwhelming in the first place. I also looked forward more to the club night as I knew what to expect. So in terms of overall happiness = even!
Now I am going to say this - the pills of old 90s, were stronger, but they had bigger side effects.
- pains in chest (probably heart muscle, other friends got this)
- hanging jaw and looking wasted while you were on it
- being utterly wiped out for days afterwards, in a sort of smash lethargic mellow way.
- clothing soaked wet. I'll never forget the cold air hitting my jeans as I left the club and something close to jumping in freezin cold water.
So I am still curious - if the pills of 90s and 2012 have similar MDMA amounts, why do the pills of today run out of steam after 90minutes vs 4 hours of 90s pills? More amphetamine?
Another thing I have noticed, on old pills I'd be pretty horny and get it up no problem. These new pills seem to knock my sex drive right out the window.
And finally, old pills seemed to make you more loved up, friendly and so forth. It doesn't seem to be the case these days.