I had 20 mg today. This was my best 2C-D experience so far, including my younger days when I took up to 50 mg (once).
As far as negative body symptoms, I had a bit of tummy/gut tension / awareness, and for a bit at T+1.5 I had some significant jaw clench/chatter. It also seemed to have a stimulating push but the feeling also seemed smooth and transparent, if that makes sense.
After sipping over 10 minutes, effects built up gradually, peaking around T+2. Effects were starting to drop off at T+3 and dropped off significantly by T+4 and then lingered until T+6 with subtle persisting after-effects. No headache! Maybe tomorrow? I do often get headaches after most psychedelic experiences.
I noticed a lot of visual activity, but it was rather inspecific and jumbled. There was some mild color enhancement but only noticeable with colors that were highly saturated to begin with. I noticed a lot of "popping" of textures as well as textural after-images. I also seemed to hallucinate textures that weren't there, and there were times in which I was a bit visually confused. All this was with eyes open. With eyes closed, there was pretty much nothing unfortunately.
I spent most of the experience listening to a compilation of classical music. I was totally absorbed. I didn't feel as much emotional connection as I do with most other psychedelics, but I felt a strong connection to the technical aspects, the nuances in rhythm and harmony, both as written and as performed. The virtuosity I perceived in the performances was exhilarating. Among the standouts were recordings of operatic soprano. In these, I did feel intensely emotional but not so much in response to the music but because I heard and (acoustically) felt the singer convey that emotion to me with great intensity.
I went for a walk between T+3 to T+4, which was a wonderful diversion. I felt very peaceful in a way much more like the trips I used to have when I was younger. I'm hopeful I will encounter this feeling more often in my future trips. At first, the sun was so bright that it completely blinded me to look in its direction, yet seeing glimpses of it made me feel heavenly. I put on my sun glasses while walking into the sun and enjoyed the light and the feeling of air moving over my body. While the visuals were mild, everything I saw looked somehow fascinating and inspiring. At one point after my eyes had scanned across the solar disk (with sunglasses), I got an after-image of the disk with detailed "flame" forms.
Outside, I also noticed that my hearing seemed very muted but crystal clear and detailed. I speculated that the muting effect was due to a significant adrenergic action, given what I've heard about people under extreme stress (like in war), but any adrenergic anxiety was completely tempered by psychedelic calm. I also noticed that there was essentially no background noise in my hearing at all.
When I returned home, I put the music back on. While listening to some rag time, I felt I could really get deep into the rhythmic nuances. Later on I switched to some lively Cuban big band jazz which fit the mood perfectly, and it felt very good to move my body around while I made dinner.
All-in-all, I had a great time, and while I can't say this is my favorite, it is interesting and unique. It may be the most mentally lucid psychedelic I've tried. It makes me feel mentally *sharp*. I am more curious about DOM now, though I'm not sure how much it resembles 2C-D or how much stronger the stimulation is.
I disagree with those who think it's similar to 2C-E. I find 2C-E to be much dreamier and to be a very emotionally rich drug, whereas 2C-D seems very alert and cognitively oriented, to the point where emotionality mostly takes a back seat to the cognitive experience. Today's 2C-D experience felt quite casual. I don't anticipate having to do much if any post-trip integration. In contrast, even my recent 5 mg 2C-E experience (which was probably less visual than this 2C-D experience) was *not* casual at all.