I also saw the show last night (with a rush ticket), and I have to disagree with the last few posts. I thought it was great. I think the cast is pretty fantastic, with Janney being the obvious standout. The only times it felt dated to me were when certain supporting characters used some less than palatable turns of phrase to describe Paul. That felt a little icky. But otherwise, I thought the whole thing stood up pretty well. And I have to disagree with After Eight: I found the Cats references incredibly funny.
As for rush tickets, the seats are in the boxes (which are totally fine for this show... though I was in the house right front box, the seat closest to the stage. I only missed the upstage left corner, but legit nothing happened there. Some stuff DOES happen upstage right, so the boxes on the other side MIGHT be a problem.) I got there yesterday at 9:55 am and was third in line. The first girl had apparently been there an hour, but the woman in front of me got there about 5 minutes before I did. Now, it was a Monday show, so perhaps there were fewer people out and about since most shows don't have Mondays. Or perhaps you could argue that even with limited options, the short line makes it seem like rush will be easy. For what it's worth, though, the theatre was mostly full with the exception of the rest of the boxes, which were fairly empty.