NBOMe-2C-I was the first of them I have tried myself and the first one to appear on an illicit market here under the brand name "Solaris", late summer 2007. Currently this name refers to any NBOMe on a glycine tablet (a common cheap innocuous medicine for sublingual administration).
David's NBOMe-2C-I is a true gem. Basically it resembles PEAs, but is much like acid in some of it's effects, especially in the emotional area. It is full with the deep glowing LSD-like empathy that is uncommon within phenylethylamines.
The activity of bomamines in humans are sometimes inverted: NBOMe-2C-I requires 500-1000 mkg for a trip. When insufflated or injected i/m, they need a full hour to come up, even 1,5 hours in the case of NBOMe-2C-I.
NBOMe-2C-I seem a little like DOI and a little like LSD, NBOMe-2C-C seem a little like DOC and a little like DOI, NBOMe-2C-B - a little like DOB, NBOMe-2C-N seem a little like DON and a little like DMT if you wish to know that.
I do not get what is 2C-I and DOI nastiness you are talking about, I see those two as a remarkable visual experience and something that is easy on the mind (not paranoid, not frightening etc), but little else than that. One may also find there some good humour and an an opened, euphoric state of mind good for social tripping, reminiscent of empathogens or acid. This effect is barely noticeable in these two however, and not really reproducible, but is the one that shines to its full extent in NBOMe-2C-I and makes it very special.
NBOMe-2C-I is amasingly positive and is a clear empathogen in an LSD manner, i. e. somewhat deeper and feeling more natural than things like MDMA. An overflowing, exuberant joy, yet not as jittery as MDMA is. This state of mind is uncommon in PIHKAL phenylethylamines and is much closer to a good LSD trip.
NBOMe-2C-I has very few side effects past the come-up, the fact that made me to regard all of them as chemicals that are easy on the body at first, unfortunatly this is not true. there is no heavyness to pull you down and pin to a single place, the body feels weightless. Like the rest, it doesn't suppress appetite, probably due to it's low affinity to 5-HT2C receptor. Yet it is mildly vasoconstrictive and thus may give you a headache shortly after returning to baseline, just like PIHKAL.
It is, of course, visually rich, like it's relatives with iodine in PIHKAL. NBOMes have less distinctive visual patterns that would repeat in every trip like those in PEAs. Besides simple visual "noise" I rarely pay attention to and don't remember well, visuals there are generally more variable. There is one distinctive visual effect, however - caleidoscopic images, like in a real caleidoscope, or, with a higher dose, true fractals, i. e. structures with self-similarity and not just any geometrical visual mesh. Those are present in NBOMe-2C-I as well, of course, and make this similarity with acid even greater.
If we are talking about 2C-I-NBOMe in regular doses, there is no anxiety at all and the overall discomfort is moderate to weak. Mushrooms are much more anxious during the come-up than 2C-I, even plain 2C-B is more anxious. Unless 2C-I is taken in a huge dose. 60 mg may make you anxious. Same is true for NBOMe-2C-I, or any other psychedelic, and taking into consideration it is much more potent not only in terms of dosage, you may guess now what was the real source of that anxiety.
I've heard such complaints about 2C-I, as well, as it's being a sort of "psychedelic speed", etc, but never heard anything like that about NBOMe-2C-I. The frequency of the appearance of negative reactions to this chemical seems to be much lower than that of any other well explored NBOMe molecule (those are B, C and N), and lower than with most of the DOX.
After-effects I was talking about are not real after-effects, it's just the chemical that haven't left the body completely. I was actually still tripping. With a regular dose you will feel almost normal yet not completely at the baseline during this time, and most probably will be able to sleep.
Question "Did you find this substance to be similar to 2C-I qualitatively?"
Somewhat. But more so to DOI in regard its CEV/OEV and LSD - in mindset.
Doses above one-two milligram(s) have produced ...some usual phenomena of an overdose mostly similar with that of any other psychedelic drug.
Doses of more than three milligrams may produce seizures and doses of less than ten milligrams may be fatal. Reality is a little more complicated of course. One of the reports on worryfying overdoses I was able to find was about a man who took 1 mg of NBOMe-2C-I by insufflation. He literally fell as if shot five minutes later, lost consciousness and had seisures.
But I also had a memorable overdose if we are talking on that subject now. At the beginning of it all in 2007 I couldn't killed myself with 30 milligrams (this isn't a typo and was accurately weighed) of NBOMe-2C-B i/m, when accidentally mislabeled packages. I was able to return to this plane of reality unharmed, without any lasting consequences of this misfortune to speak about. There were several lethal doses in it - if we are to estimate them the proposed way. Nevertheless, I am alive and feeling fine, and I can't do anything about this fact. What's worse, I am not at all unique in being so tough. There is a number of reports about similar accidents found at several russian thematic web-resourses. Their story is always the same: someone accidentially overdoses with 5-10 mgs of NBOMe-2C-C/B/I, and after suffering extreme DMT-like trip gets off with only a scare. People like me or these others who won't die from what was called a "lethal" dose in the citation aren't a rarity, it looks more like this is a norm (or one of several norms to be more precise). For us who are the toughest ones in this regard, NBOMe molecules are nearly as safe as the least toxic structures among 2C-X PEAs (that seem to be the safest psychedelic phenylethylamines I am aware of).
This shouldn't serve as a cause for optimism towards phentanyl-like structures we are talking about here. There are also people, who are also quite numerous, for whom their safety margin appears to be closer to that of DOX. For them a suicide by means of 20x-30x NBOMe-2C-X overdose isn't necessarily impossible. And there are also individuals, not as numerous (but it makes no difference; that they exist is just enough), who will find NBOMe-2C-X to have the safety closer to that of benzodifurans like bromo-dragonfly (it would probably be better to say they have no safety reserve at all). These latter individuals will be the first to get into dangerous or even lethal accidents, if we are to see such in the near future.
While there is no way to find out beforehand who is who, or what may happen if somebody will take one of these chems.