I have yet to try 4f-PvP. I found 4f-php to be what I was looking for. The crystalline powder rather then crystal. The trick is that, it doesn't work it's magic if vaping in the conventional way . You need to place 5-15mgs of the powder in to the foil. Put a drop of water , just enough to wet powder then put a thin lay of baking soda. You want it to turn yellow then hit it . Then the smell, the taste, is just like mdpv or A-pvp.
Has anyone found 4f-pvp or any new rc to be better?