Managed to try out the defqons recently at a UK event. Not sure how much use this is as another drug (MDA) was also used but it went as follows:
Combo pills:
Myself - 60mg MDA + 1/4 (yes, slightly less than a third) defqon. as above these were combo pills (caps) I made
Two friends (each) - 80MG MDA + 2/3 defqon.
Onset for my two friends was faster. I'd say about an hour to 1.5 hours. For me it was about 2-3 hours for some reason. Effects, well my two mates were fairly smashed off these, smashed as in mongy smashed, not much energy just generally stumbling around hugging people. I'd say I had a fairly mellow experience (which is what I prefer) but this is logical since my dose was lower, and my body weight and muscle mass are higher than two friends. Same experience for me, although it was mellow it still made me wanna sit around and chill out.
Duration was probably about 5 hours but its unclear wether this was wholly down to the MDA, or the defqon MDMA. We tried the MDA on its own a few months earlier (similar dosages) and the effects were around 5 - 6 hours, until you could safely say the main effects had more or less worn off. On a side note, when I did MDA on its own I got no OEVs, however in the minibus on the way back as the shadows created by the motorway lights were moving around in the minibus I thought people were waving their arms at me. Possibly down to the combo of MDA + MDMA.
All in all, not particularly a scene from the late 80s or early 90s, dancing your tits off all night or anything. Perhaps they were all amphetamine combo pills back then. To be honest I think these two drugs (MDA and MDMA) are far more hyped up than they actually turn out. We may stop doing them and just stick to a couple of beers. Hopefully this will help someone. I don't think the defqons are anything special, just a hard press that appears to slow down the onset.