There hasn't been anymore replies here for a while, but I figured add some of my on info about DMC since I've used probably an ounce of it or more in the last few years.
just my own experience, so dont take it as universally applicable.
Its likely relevant to note that I have a family history of dopaminergic psychiatric problems, including ADD, restless leg syndrome, addictive tendencies, narcolepsy, and depression.
My shitty medical system has diagnosed depression and a sleep disorder, but almost 100% certain I should've been diagnosed with ADD.
The DMC HCL I had was always tan, almost peachy, clumped together a bit but when ground to a finer powder it looked nearly white and was chalky. I think when I started I was using 1-200mg doses (nasally) but after a little while I wouldn't bother measuring.
Nasally it does numb the sinus, but doesn't dissolve rapidly. he effects didn't come on instantly but I've personally never once gotten any 'rush' from stimulants even with meth or I.V phenmetrazines.
unlike most stimulants for me though, I did gleam euphoria and entactogenic feelings after a few lines. The feeling always started in my thighs, increased libido and appreciation for life, decreased inhibitions at the peak. after the peak of a binge I will just end up tweaked paranoid, hypervigilant, and with oversensitive nerves if I keep using. Does have an urge to re-dose effect.
More comparable to methcathinone than amphetamines. I only used cocaine once so i cant compare it to that sorry.
Its easy to crystallize as the "freebase" carbonate salt. beautiful shards of orange rhombus looking crystals. As the carbonate it does give effects vaped (and tastes kind of good) but it would never vaporize all the way, always leaving behind progressively more burnt residue. The effects did come on a lot faster but were more short-lived, and the fiendishness as more noticeable. instead of the norepinephrinergic tweaked out residual effects from snorting it, I would just get fatigued and usually nap.
hopefully someone finds this useful. I used a lot of it but I definitely wouldn't choose it over amphetamines or phenidates.