I'm back in the US and actually the food was really good in that flight for the first time in many years.
One question - what would have happened if the flight was canceled after I upgraded? I assume I would go back to Economy, right? It took me two hours to get to the airport (but I was still there early). However, the crew also got stuck in the same traffic and the flight was about 40 minutes late (UA63). But we didn't know it at the time, so I was worried it would be canceled.