Hey, I was there. All in all I was very impressed. The grad students seemed very happy, and the professors - even the very famous ones like Sargent and Ok - seemed extremely approachable. I think they take graduate student advising very seriously, and maybe their success on the job market this year was due in part to that. I tried my absolute best to get anyone to say anything bad about the program and I couldn't get much. The biggest gripe was that first year is hard but I think you'll get that everywhere.
Though NYU has prelims, the failure rate (after 2nd attempts) for the past 4 years has been 0%, which is extremely reassuring. The entering class size is usually about 20 and only 10 were on the job market this year, so I'm guessing some people still leave for personal reasons, but it's nice to know you almost definitely won't have to leave unless you want to. I checked out the first year housing and it was surprisingly nice, the apartments are huge considering they're in Manhattan.
Obviously I don't have other flyouts to compare it to, and I'd bet every top 15 school looks fantastic on flyout day. But I was really, really impressed. If you have any specific questions feel free to post them or PM me.