*EDIT: correction made.
@OP
MDPV is an awful substitute for MDxx - by comparison it has almost none of the safety profile or extensive testing. it also, as the recent past may indicate, causes a vast array of unpredictable side effects that sometimes results in people being hurt (or losing part of their face due to a frightened individual). in individuals who may or may not have drug dependence problems, it is known to cause users to compulsively redose, sometimes to the point of causing injury or inflicting self harm.
does this sound like the beautiful, euphoric, sensory enhancement-inducing, entactogenic MDxx experience to you?