This morning, I received an e-mail from Delta apologizing for my LAS-ATL flight two days ago being overbooked. They, in fact, asked me to fill out a questionnaire about how it impacted me. Uh, well, it didn't. In fact, I had no idea that it was overbooked. I was not informed of it at check in and if the GA made an announcement, or called for volunteers, I didn't hear it. I did hear her announce that the flight was full and that the upgrade list was closed. (Neither impacted me in the least as I was on a paid FC ticket.) In fact, the only thing that impacted me in the least was the fact that the woman sitting across the aisle from me had so much in her roller bag that: a. She could not pick it up to put it in the overhead compartment. b. It was too heavy for the FA to be able to pick it up. c. When I picked it up we discovered that it was too fully packed to be able to fit in. Hence, I had to give it back to her, wait for her to take some things out, and then pick it up again.