I had paid for an FCM upgrade on a flight two weeks ago. I received a notification that my flight was delayed (inbound flight diverted due to thunderstorm) and I was able to get to the airport in time to catch an earlier flight home. The earlier flight was also delayed due to WX (so I only arrived a few minutes ahead of my original flight) and I was actually able to get confirmed in the same cabin due to a no-show. As far as experience goes, I came out even, but as expected, I did not receive miles or MQDs for my seat upgrade. Since I switched due to IRROPS, figured ORC was worth a shot and I simply asked for the 99 MQD and 495 miles. No ORC, but in a rambling (AI generated?) response, they gave me 10,000 miles for a weather delay. As stingy as DL has been with comp of late, this was a great result