I've been the past 2 years, but won't be able to this year (SRS recovery). Also presented a few times last year, once with my mother, Jazz, Jeanette about parents/daughters stories of youth/teens, media work, etc. and the other with a FTM teen named Chris about our teen transitions (going by Jessica, my first name only, if you look at the 2014 handbook). It's awesome, we got like 300+ people, overflowing crowd, out the door, for the first one, and the second one still got hundreds. People are so nice after, talking with you, and really sharing themselves. Finding out how much you've helped someone else out is the best experience there is.
I'm not the best judge of what goes on there, but some people really drone ON and ON in the audience about themselves, unrelated to the topic. I'm usually a part of a small subset of youth transitioners that goes there yearly, who are really tight knit, warm, accepting, but not that large. So while that's true, and it's awesome to have that, that's not the experience for most, since we make up like 2% of the conference.
Given it's free, it's well worth it. If there's any questions you have from any aspect of this, please, let me know.