I have tried this stuff recently, so thought I'd register as there didn't seem to be many reports.
I recently came across some 4-Aco-DALT through a friend who has tried most psychedelic RCs I can think of. He didn't tell me much, only that it was nothing like 5-MeO-DALT (which I haven't tried) and had more in common with mushrooms and other 4-substituted tryptamines. He also recommended snorting it, and said that he and friends found 80mg to be equivalent to approx. 2g dried mushrooms.
Anyway;
4-AcO-DALT Fumurate [100mg insufflated, no tolerance]
T+0:10 - some colour enhancement, faces seem to form out of anything circular, sounds seem distant
T+0:15 - mushroom like OEVs, a slightly nauseous feeling of constantly rotating or seasickness, definite 'tryptamine buzz' very much like 4-AcO-DMT, my hearing is slightly distorted, as if through a quiet ring modulator
T+0:30 - I decide to lie down as the nausea is getting a bit stronger. strong OEVs include waveforms flying out of the speakers and an anthropomorphisation of everything - clothes on the floor would form lions and panthers, and other animal faces would form from the junk in my room. I have only previously met psychedelic animals on Ayahuasca, though that was a less lighthearted affair.
T+1:00 - The trip finally starts to plateau. I lay down on my bed with my eyes shut watching the 'cosmic theatre' of various shadow-like entities, which was fascinating yet slightly intimidating. The entities did not really interact with me, as they might on mushrooms, and for this I was grateful as they did not seem particularly welcoming. There was more a feeling of observing things from a distance, not unlike a dissociative, unlike the more 'interactive' experience of other tryptamines I have tried, such as DMT.
T+1:20 - Coming down. The memories which seemed so clear only 10 minutes ago are already beginning to fade. My vision is still overlaid with incredible geometric patterns. I stand up, and the nausea returns a little for the first time since lying down, though nowhere near as badly. I sit down and drink some water.
T+1:35 The trip ends very suddenly and abruptly, though some tracers and mild CEVs remain. I feel a wonderful afterglow, not unlike DMT. I am surprised how alert and awake I feel mentally, though I still feel rather sluggish physically. Music sounds wonderful, and some weed an hour or so later brought back the CEVs a little.
Conclusion:
I would compare 100mg insufflated 4-AcO-DALT to approximately 3-3.5g dried mushrooms with a ~90 minute duration. The only other 4-substituted tryptamines I have tried are mushrooms and 4-AcO-DMT and it was very similar in character, moreso to 4-AcO-DMT than to mushrooms. This was also my first time snorting a tryptamine, so an oral experience may well be quite different. While not as 'spiritual' as mushrooms, it was none the less very introspective and philosophical in nature.
The nausea did put me off a little, and I think I would take mushrooms or 4-AcO-DMT over 4-AcO-DALT in future, though I would be willing to try it again orally if I ever came across any more. I think the best use of this compound is as a 'compressed' mushroom-like trip - by T+2:00 I was pretty much completely sober. However, I have not tried any other 4-substituted tryptamines so others may also have a similarly short duration when insufflated.