I don't know Elizabeth (sure she's great), but the other three are amazing and always quite helpful.
Kat's been an amazing connector both within the YC community and in supporting applicants. She's connected me with some potential fintech applicants, which I think is a great way to leverage alums.
We met with Yuri a few times before he was a part-time partner and he was quite helpful and encouraging. We're in the enterprise space and he told us to just keep fighting the long-sales-cycle fight. That advice came at a critical moment where we really needed to just keep going through the slog.
I haven't talked to PC much since leaving Stripe but he obviously build a great company and culture there that I really enjoyed. He's going to be an amazing resource for YC companies.