I haven't had 3-FA for many years, but I loved it back in the day.
I'm not a big stim fan because I tend to get stun-locked by anxiety too easily when I use them, and then I end up playing the balancing game. That is, taking benzos to offset the anxiety, then losing the stimulation and taking a bit more stim to get it back, then more benzo, and so on. So the best stimulant experiences for me are the ones where I feel paradoxically calm but alert - 3_FA was great for that. A couple of modest lines up the nasal was like a clean, fresh, minty slap to the face... just a nice pick me up rather than the "this it what it feels like to chew 5 gum" type thing, and fairly forigiving in terms of side effects.
Is that drug still around? I rarely hear people mention it and seems like it doesn't have much of a fan base.