I am hoping for an upgrade next week. I will be staying at either the Paris or Hilton (I have status with HH). I've read about the $20 "tip" for the agent at check-in. Is this a Vegas myth or has antone here been successful doing it. I'm also having a difficult time deciding between the two properties. Both have great "deals" right now (Hilton's about $20-25 less per day),but I understand that the Hilton is an easier upgrade. Your thoughts.