AVOID.
Not tried it personally, would STRONGLY advise people do NOT touch it.
The reason for this is, that para-chloro, bromo- and iodoamphetamines are potent serotonergic neurotoxins. They cause an initial drop in brain serotonin levels, followed by neurotoxicity to axons themselves, these amphetamine compounds are used to lesion animal brain serotonergic pathways experimentally to test for response, and elucidate neuropharmacological mechanics. It is possible for that this does not extend to the beta-ketones, or some of them, but however, this should be taken with several bags worth of NaCl. (the observation, not the drug)
This is going from the release of brephedrone, ugly bastard that it looks like in principle. Lets not forget two things. One, is metabolism to the beta-hydroxyamphetamine, which is as ephedrine/pseudoephedrine are to the methamphetamine analolog, where the N-methyl (the group behind that ring structure there on the nitrogen, represented by 'N') which is replaced by two ethyl groups, tied together, in a pyrrolidine ring, and the alpha-methyl group just behind on the first carbon (the kinks in the chain, plus its tip, on the left hand side) is extended from a one-carbon methyl group to a three carbon n-propyl (this n denotes not nitrogen, but in lower case 'normal', as opposed to isopropyl where in a three carbon alkyl group one of those carbons is relocated from being a linear chain, to the first, third and second carbons being connected by a single bond, rather than only the one in the center connected by single bonds to each of the other two) Or rather, the cathinone/beta-ketoamphetamine homolog of the same.
And that para-chloroamphetamine was briefly introduced as an antidepressant before this was understood.