A newcomer from Ukraine. SEI (ISFP), 24, a painter.
I've been into socionics for over 5 years so far. I knew of it even before, just didn't pay attention. This changed after I had read a description of SEI and realized that some 95% of that can be applied to me. Then I read several books on socionics in Russian featuring model A and many other things. And then examined my relations with best friends. One of them turned out to be LII (INTJ), and another ILE (ENTP). Thus, after 10 years of activation and 6 years of dualisation I seem to understand what this is about. I don't know much about the MBTI though, for me it's primarily a language to translate socionics types into, to make people understand. But surfing through Russian socionics forums and communities I came across another thing called psycho-yoga or psychosophy that features 24 types of personality. It's way not so well organized as socionics though, but still could be useful.
Well, that should be enough for now, nice to meet y'all!