Regarding 3-FPM - I have had three batches, which were each drastically different from eachother, which makes me think it may not be the best thing to compare stuff to, as there are clearly multiple very different things being sold as that... The first batch was absolute *fire* - small crystal shards, long lasting, but bizarrely smooth. As in, I did some at night, went to sleep later, and then the next day, was exhibiting stereotypical stimulant behavior like cleaning and stuff. Amazing.
Second batch was a weak and unremarkable stim, third batch was not as weak, but still not the epic stim of the first batch. I conclude that either the first batch, or the second and third, were a different chemical that isn't 3-FPM. The third batch (I think that's all I still have) didn't seem all that remarkable vaped, either... wish I had thought to vape some of the first batch when I had it. But we all thought the re-up would be the same.
Interesting about 3-FEA; I think I have some of that coming (I had a chance to place an order with an RC vendor, and just got some of everything they had - shoot em down and sort em out on the ground); had been thinking it would have been a straight stim, rather than an mdma-mimetic - how is it for that?