Sheesh, my rush experience was so easy I questioned whether even to post, as I thought I would be stating the obvious since no rush difficulties had been previously reported (and frankly, I did not think this would occur with this play). Based upon the thread thus far, I see I was fortunate. My experience: for the Wednesday January 4th matinee, I got to the box office at about 10:15AM - one person was in front of me at the window, but he was not there for rush. I got one front row orchestra aisle seat (A2) for that day's matinee with zero problem. Lovely box office person indicated I "came at a good time". No one behind me as I left. Beginning and end of how I nabbed a rush seat. Don't know if this was a fluke - though I also realize Wednesday matinees are usually a bit easier.
For those wondering about the seat itself, being so close to stage was heaven for me given Stoppard's wordiness and the exceptional cast. A table and chair down stage a bit blocked a little of the upstage in first scene but did not bother me or take anything away as the tableau was otherwise so expansive-- I didn't feel I missed the "big picture." The only strain from my seat was to read the scrim with the family tree on it when it did appear, but since the ability to keep the characters straight as they age (and in instances) and are replaced by other actors was important to me, I skimmed the play earlier and got a handle on all that beforehand. With Stoppard, for better or worse, I usually expect some prep work. Perhaps a bit too obsessive, I also kept the family tree provided in the Playbill open on my lap during the show.