etwinchester in a nutshell, you get to feel like someone else is taking care of everything for you. As I am the "caretaker" in my family, having the concierge staff to handle everything is the best part of my vacation. Plus there's the lounge, the food, the great location....
YCFAN - I know what you mean; I have had mixed experiences with the Poly IPO. The CMs switch between IPO and the concierge desk at the Poly, so it depends on who is where. There is one CM in particular who really should not be working there, as she gets overwhelmed very easily and has dropped the ball on us on several occasions. I usually try to speak with/e-mail Melissa, Marilyn or Kathy, who are all terrific. I have heard great things about Amy at YC too.