As you can see earlier in this thread, I asked for information about the rush and subsequently gave it a try for myself. I went on a Wednesday (like a Saturday in that it's a two-show day, but unlike Saturday in that it probably is less busy) but I got there right around 8:00 (like 7:50) and was about ninth on line. The line from there wrapped around the block all the way to the stagedoor on 53rd. I was easily able to get three rush tickets in the front row center for that evening's performance. My advice would be to be open for both show's if you can, and, if you want to be absolutely guaranteed, get there around 7:00, and probably no later than 8:00. The front row was a great view. I missed perhaps one or two tiny things from the first row, and everything seems to be staged either downstage center or upstage on a platform, so the view is fine. By the way, I recognized a lot of people from towards the end of the line sitting at the rear orchestra in the rush loser seats, so those seem to be pretty easy to get as well. Hope this helps!
"Art, in itself, is an attempt to bring order out of chaos."-Stephen Sondheim