15mg O-PCE insufflated. This is a potent PCP analog and demands serious respect. Onset was within 10 minutes — a cold, analytical dissociation very different from ketamine's warm wooliness.
The headspace was stimulating rather than sedating. I felt lucid but completely detached from normal concerns and anxieties. Spatial awareness was dramatically altered — my room seemed to expand and contract. CEVs were architectural — vast dark spaces with impossible geometry.
Duration was long for a dissociative — about 5 hours of significant effects with residual effects for 12+ hours. This is a major difference from ketamine and requires planning.
The potency demands accurate weighing (milligram scale essential) and the duration means you're committed once you dose. Combining with any other substance is extremely dangerous. This is for experienced dissociative users only.