Thank you both for posting these great tips.
Somewhere along the line I had picked up that running eopkg dc
after an update would mean that you couldn't roll back to the previous update.
But I can't find where I had gotten that from. And, being that the Software Center automatically deletes the temporary package cache, it wouldn't make sense that anyone who uses the SC would lose the option to roll back.
Could someone confirm that this idea that I got is totally erroneous?