I've had MMDA one time before... At least it was confirmed MMDA. It is definitely more psychedelic... the brain movies when you close your eyes are fucking intense - I was driving a racecar up through the mountains and watching things that happened in my past when I was coming down. The feeling of it feels like a mix of MDMA and MDA. It has most of the lovey feelings of MDMA but it has a psychedelic edge like MDA so it doesn't feel as fake.
Duration was about 5 hours... normally MDMA lasts 6 hours for me (one of the few drugs my body doesn't get rid of ASAP) and the peak was about 4 hours of that.
As far as stimulation, it seemed comparable more to MDA than MDMA - it was more stimulating but not that much more. Certainly nothing like 2C-I.
The comedown was nice. Came down and fell asleep almost immediately. Deep sleep. We got used as furniture at the house party. There were only two of us that took nothing but the MMDA pill and we both experienced the intense brain movies. Euphoria was a bit different. More mind euphoria than body but still felt pretty great.
Also, the urge to redose was not there at all. Usually when we take pills or molly, we keep going all night. When the MMDA started to come down, we were both satisfied with the great night we had while everyone else continued to binge. I should note that I tend to eat 5+ pills a night with the most I had ever eaten being somewhere around 20 (I had 25 pills but we know I gave away 3 and consumed at least 18 but not sure if I took the full 22 or not) and I used to binge hardcore on methylone too until I got the hang of methylone dosing so the urge to redose being completely gone was a pleasant surprise.