i tried it on a weekday and there was about 50 people there, it is probably more busy on the weekend. so you would have more of a chance on a weekday. Good Luck!
I tried it twice during the opening week and got the last ticket on my second try. There were about 40-50 people there. The seat locations vary. I got the last row of the orchestra--a chair, not a theatre seat, next to the sound board.
Coach Bob knew it all along: you've got to get obsessed and stay obsessed. You have to keep passing the open windows. (John Irving, The Hotel New Hampshire)