I successfully rushed today so they do have Saturday rush. Got in line at 8:30, and I was third. There were about 8 people in line by 9:10 and the line got longer closer to 10. My friend and I got amazing seats. Second row center for the evening show with no obstruction, $37.
I rushed at noon yesterday, and was given three box seats for the matinee. My seat (the first one) was partial view, but I didn't miss anything, as the show is set heavily in the center of the stage, and even the scenes Stage Right were not obstructed for me at all.