I've done aMT/MDAI/Adderall and, though I've never done MDA, that's the profile of monominergic release and 5HT2a agonism I was shooting for. It did feel like a trippier, more dopaminergic MDMA, but the serotonergic effects were probably a little overstated compared to what I imagine MDA would be. Whatever, though, it was pretty incredible and lasted far longer than MDA is said to (aMT really lengthens other triple releasers' peak effects as well).
The problem with aMT/other triple releaser combos is you can't know how aMT will enhance the effects of other compounds, and you're flirting with serotonin syndrome combining it with serotonin releasers. For instance, I took aMT and 4-FA and the synergism was really intense. It was only 12 mg IM (for the aMT -- about 25 - 30 mg oral equivalent) and 80 mg rectal for the 4-FA, but the result was probably the strongest chemical empathy I've ever felt, way above the sum of its parts. At the same time, though, combining aMT with MDAI (before I added Adderall) resulted in barely different effects than with aMT alone. It was until adding the Adderall that I noticed, "hey, this is different than my aMT/Adderall without MDAI experiences". Sorry, I forget the MDAI dose, but it was on the lowish end because of the serotonin syndrome concerns. Also, combining aMT with propylhexadrine resulted in an experience that did seem to be the sum of its parts, i.e. no synergy. So it's all unpredictable.
I can say that aMT smooths out the comedown of 4-FA, MDMA and propylhexedrine to the point where I don't notice it. I wouldn't take my experience as gospel, though, because I don't tend to get bad comedowns, not in terms of feeling sad at least (maybe a little with propylhexedrine, which is like meth to me). As expected, I felt significantly more emotionally flat during the following days than if I had taken just 4-FA or just MDMA, though.
As an aside, I've also been on a break from serotonin releasers for about 4 months now, as I was getting brain zaps after every time I did them by the end of my experiments. I'll be trying to stick to a once every three months at most schedule from now on.