So I don't post on here much but wanted to share my experience.
I was wanting to see the show this last Saturday night 5/20 @ 8PM. Telecharge had nothing "pop up", watched resale sites but the cheapest seat was going for $350 and eventually got sold. Went to the box office around 5:30PM and the box office clerk recommended the cancellation line.
I got in line at 5:45PM on a Saturday, there were 6 people ahead of me. At about 6:10PM, someone came out and asked how many tickets everyone needed and the first 5 people got to go in and purchase. By 6:30PM, the line had about 15-20 people in it. By 7:00PM around 30, and then people started giving up throughout the line. At around 7:15, he came out again with a pair of tickets. Luckily, the girl in front of me only needed 1 ticket and I was by myself. I got Row G Center orchestra for $189. An amazing deal if you ask me and I felt like it was worth the stress I had had that day.
At 7:59, the two people standing behind me in line (positions 8 and 9) got let in and sat right next to me.
Totally worth doing this! I wish I had done it earlier in my trip and not waited until the last night. Hope that helps!