High dose DCK, with n-ethylpentedrone, etizolam and tianeptine felt like I was rolling harder than any dose of MDMA. I was also massively hallucinating and going in and out of reality. Memories from when I was in the womb returned to me, and i had the realization that while in the womb we were omniscient beings with tremendous knowledge, and upon awaking we forget it all. I don't believe this is true but it was overwhelming, and accompanied by the most intense euphoria.
I'd never do it again. I didn't feel back to normal for about 6 weeks after that.
That combo was a heavy duty, high dose assault directed at the following:
NMDA
Serotonin transporter
Norepinephrine transporter
Dopamine transporter
Dopamine (D2) receptor (via the DCK)
GABA-A complex (BZD binding site)
Mu-opioid receptor
A host of other victims (though less prominently)