I have nothing against rc´s in general since alot of my favorite psychs are considered to be research chems,
Gems like mxe, 4homet, 2c-e and 25i have given me alot of insight and are easily in the same class as some of the classic compounds.
But i will have to say that most of these new stims seem very fishy to me, the side effects seem awful for alot of them and i would not bother researching them since they actualy seem pretty dangerous.
My friends who have tried mephedrone tells me it had the most awful comedown ever and abusers of it has gotten blisters on their body that smelled of the drug, this to me is a big warning sign.
Also look up some mdpv reports, this alone should make it clear that these new generation stims are shit.