I did a lot of reading about 4-FA and 3-FA (yes,
3-FA not 4-FMA) before getting some, as I had seen the posts suggesting neurotoxicity. My conclusion was it probably isn't as dangerous as some people were making out. I suggest anyone interested does their own research, though, as I have to admit I was actively looking for posts that made it out to be OK! They came from respected members though...

(no, not rs69). I mean those fuckers who seem to know neurochemistry.
Anyway, they're both pretty enjoyable. I didn't read anything about 4-FMA to make me want to try it.