I was one of about 65 people giving posters in the Tuesday session. I can't comment too much on the other posters as I was busy giving mine, but the session seemed to go well. The venue was a semi-open exhibition hall next to the hotel.
There were a few logistical glitches. The poster boards were delivered later than expected. The poster session went until 2200 MDT, at which point a timer cut the lights abruptly. But for the most part, it went well.
I am now done with my duties for the week; I get to listen (or not) to the remaining sessions.