1 vs. 100 moves at a pretty good pace; it has small breaks with commercials but they are not forced and are not overdone. Since this is the beta, we saw nothing but Microsoft commercials. To be honest, the two hours went by way too fast, and we had hoped there would be more when it was over. It is as simple as pressing A, B, or X, and the questions were all very relevant to current popular culture, even some that pertained to events that have happened in 2009. I will admit, and was warned ahead of time, I was at a distinct disadvantage when it came to the Canada-centric questions - but I did not care.
I experienced no lag, and enjoyed the entire experience - I can see myself playing this all the time. Getting into the game took a couple minutes, but we made it in before the show was full. At one point during the show, Cashman said there were over 10,000 people playing. At regular intervals through the episode we were shown stats on questions answered by the Crowd, Mob, etc, all in nice bar charts.
I was amazed at how much you can do with your avatar on screen. Using the Y button and left or right on the D-Pad you can change hand gestures from everything from clapping to jumping up and down, a staggering amount of emotes in fact. It adds a little something to the experience, which is polished and just feels like they have nailed it. I can't wait until the U.S. beta starts, but until then, I have a reminder set for the 7 PM show Saturday night. I just hope the Live Party invite trick works!