^ I have done quite a lot of this substance. Basically I ordered 100g of mephedrone about a year ago and got ethcathinone instead. At first I was pissed, but later I was very glad it happened. First of all ethcath doesn't fuck you up the way meph does IMO. The batch I got was quite rough on the nose and a few of my friends got a sinus infection from using it over a weekend, but otherwise I didn't feel any negative effects on the body.
I know a lot of people disagree, but IMO its the RC closest to coke. Its subtle but has a nice stimulation and euphoria.
I used to do somewhere between 300 mg to a g per session without any noticeable sideeffects (except the fucked up nose, but that could be sorted by oral ingestion).
I know this is bad HR, but it combines very well with methylone 8)
Jamshyd. I seem to remember that ethcathinone is in fact the active metabolite of diethylpropion, but done quote me on it.
I think it could be "functional" as it is subtle, but I have only used it recreational.