MDMA rush is slower than meth and MDMA gives you the feeling that you love everything, you are soo happy and you move everywhere, meth rush, for me is directly and you feel like a superhuman, with the biggest brain of all time, you think you can do everything, you think you know everything, but u really feel at 10-15min, for the mephedrone I never test but I think its like MDMA but tell me if I am wrong (I say that by experience)