There are some interesting ideas in there, but I think it's ultimately just an attempt by our beloved late narcissistic contemporary Leary to rationalise psychedelic experience. The psychoanalyst in me can't help but see this as an ego-constructed hierarchy designed to reinforce existing beliefs about one's own higher state of being as well as the positive value and spiritual importance of his favorite drugs. I think it's most interesting as an insight into how Leary saw the world than a serious psychological theory to explain human consciousness or behavior. I don't know how one would go about constructing a formal model of consciousness around at least what I gathered from the wiki article... It just seems like a series of assertions, and eight vague descriptions of states of consciousness, without a clear formalised sense of what consciousness, subjectivity, language, etc. truly "are" or "mean" or what have you.
Then again, as a psychoanalyst I have my own pretty strong opinions about these things that seem pretty much incompatible with this model, so absent a discussion with Leary himself or a well-read advocate of this theory I doubt I'll find much common ground with it. The very idea of approaching subjectivity and consciousness by trying to enumerate a list of specific mental states seems silly and counter-productive to me. In vague terms, it's easy enough to talk about experiences in terms of these circuits, but any attempt to formalise it for, say, clinical use would run into a lot of problems when subjects' experiences don't neatly follow this 8 step program of Leary's. I would also question some of the implicit assumptions about how separate some of these behaviors really are - bracketing sexuality to one of the eight 'circuits' in particular seems pretty untenable unless part of the idea is that some, if not all of the circuits are always at least partially active... But at that point, it would be better to drop the hazy 'circuit' metaphor and start talking about things in specific terms, like Lacan's drives, desire, etc.? I could care less that sexuality is part the 'fourth' or 'adult consciousness' circuit and the highest of the 'normal psychology' realm - how does sexual desire actually function, and how does it relate to other aspects of experience?
All in all, it reads like Leary spinning a good tale like he always does, but without much real substance beyond a few clever observations, certainly not really much of a well-developed psychological model. Then again, my internal comparison of what I gathered skimming a wikipedia article to my own extensive beliefs and reading background in Lacanian theory isn't really a fair fight, so I'm probably just poking at a straw man misinterpretation anyway
