Not a huge MD fan really, but these days, unless I know VERY well what a given batch of beans is like, from multiple users all taking solely from that selfsame source, then its either do it oneself or go without, as far as I'm concerned. If I cannot personally observe it from birth to the moment it goes down the hatch or up the hooter, then its just not getting taken, end of.
PMA and PMMA are the reason. I realize that anethole and estragole are more readily available in the forms of their respective essential oils than safrole (who goes to the effort to control the availability of utter garbage after all? no point telling people they cannot have what nobody bloody wants to begin with)
But its fuck all excuse, not when there are a host of natural phenylpropenoid-laden essential oils that can be turned into better things than PMA/PMMA.
About the only justification for their existence, is as a set of L-plates to wear, so to speak, for someone intent on mastering turning such compounds into their respective phen/phet derivatives, for those who wish to learn how to perform the chemistry involved, yet who baulk at the thought of consigning valuable precursor materials to the potential dustbin if they fail first time, and in terms of yield fine tuning the conditions. Make it, characterise, workup practice, then down the shitter afterwards without having to put it into some poor unsuspecting fucker buying a few pills for their weekend.