Well, I conducted my little LSZ+AL-LAD experiment.
This morning at about 9:00 am, my friend M and I each took 150ug LSZ and 150ug AL-LAD simultaneously. It was taken on an empty stomach. The onset time was unusually fast. Both of these chemicals have always taken at least two full hours and generally have what I would call a very gentle come up. But the combo hit quite rapidly with peak effects reached within an hour and a half.
What surprised me was how unpleasant the come up was. I've never experienced negative effects from either chemical on their own. But the come up today was full of anxiety, dysphoria, and uncomfortable bodily sensations including mild nausea. There was also a strange mental fog, similar to the head space I usually experience with AL-LAD, but of an uncomfortable intensity.
This all resolved quite well after the onset was over and we were well into the peak. No more negative physical sensations were present, in fact I would say that I felt incredibly physically comfortable, bordering on euphoric, though with a bit of energy that left me generally wanting to be on my feet. The mental aspect became quite comfortable, the previously mentioned fog cleared completely and communication was comfortable and easy.
I could definitely tell that each chemical was present and "doing its thing" but the two complemented eachother nicely.
Duration was somewhere in the range of 8 or 9 hours, appetite returned near the end as usual.
All in all, I enjoyed it quite a bit. I might actually prefer it to either chemical on their own. But I'm not sure if I really want to put myself through that come up again. My friend M found the onset to be just as unpleasant as I did. It was a great and worthwhile experience, but if you choose to try it, just brace yourself for a rough beginning.