The description of 2-FA being more like dextroamphetamine sold me more. 4-Fa is good in a mashy way but I couldn't really see me binging it much. Seems to mix well with almost anything aswell.
In an attempt to steer this thread vaguely back on topic, would 4-FA mix with meph? Or would it end up being a bit too overwhelming and then the meph would wear off anyway leaving just the effects of the 4-FA? Actually the more I think about it, the less sensible or appealing this combo sounds.