25C-NBOMe / NBOMe-2CC, threshold effects at as little as 0.05-0.1mg, but properly active at more like 0.2-0.5mg. Higher doses of 1mg+ produce amnesia and a burned-out comedown feeling for several days after, so there is little further benefit from doses much above 0.5mg. Convulsions have been reported from larger doses of several milligrams or more, so likely to be potentially dangerous for the inexperienced especially as raw powder.
Very clean and visual trip, but somewhat lacking in profound insights, light hearted but with little depth. Duration of strong effects is around 4-6 hours depending on dose, but with a milder afterglow extending the duration to perhaps 12 hours or so in total. Time to onset is around 15mins after nasal dosing, 1 hour for peak effects. Faster onset and shorter duration if vapourised, sublingual and rectal administration also effective, but oral activity produces only a bare threshold even with doses of 1mg+.
Quite stimulating and euphoric, sometimes a hint of "candyflip" type effects but predominantly psychedelic, slightly reminiscent of 2CT2 or 2CT7. Also the bioavailability is weird and unpredictable, often several people will have what should be the same dose but have widely differing experiences, or the same dose taken on different occasions will seem quite different strengths. However this could easily be from measuring errors given the high potency, and hence small dosage...