I don't consider myself out and 'proud' per se but I am very, very out. I feel that, because I'm strong enough to take the flak for it (though there's very little of that) it's a responsibility to make sure that people see a strong, happy, and well-adjusted woman who isn't ashamed to be a transwoman. Being proud of something seems to imply that I take pride in being trans. I don't. If I could flip a switch and be GG, I'd do it in the blink of an eye but I am what I am and my history and perspective are part of who I am and I see no reason to hide that or be ashamed of it in any way.
Another aspect of why I'm 'out' is that it's an opportunity to educate people who may not know what's up with transwomen. I regard myself as very well educated about trans issues, the medical science behind our condition, and the cultural pressures which define our current situation. If I don't share that with people who might not otherwise be exposed to those ideas, then they might go on thinking that we're some kind of perverted child-molesting psychopaths, no matter how many times the talk shows have trans segments.