My wife and I attended all three days.
We're completely new to homeschooling (to start this fall). So, as a first-timer, I can say that (for us) it was very ENcouraging, not discouraging at all.
It was encouraging to see that there were SO MANY people who are choosing to educate their own kids. I guess mostly what we wanted was to be affirmed in our choice. We're planning to follow SWB's WTM method (to the best of our ability to do so) and it was helpful to be able to sit in a room with her, to see that she's competent, authentic, believable (probably sounds silly to say that, but if we're trusting our children's education to her philosophy, it helps to know she's capable).
We had a wonderful time, picked up some of the curriculum we were needing, heard some great speakers, and were just generally impressed. We'll definitely go again next year.