So, to follow up after a day or two: the only person who says that they have completed the migration is saying that their drive is now non-functional. Is this accurate? Has nobody completed the process with a functional drive--to be clear? I can't really tell if anyone trying to help Chase has actually completed a successful migration, or if everyone is just offering feedback based on hypothetical situations.
I don't even want to think about starting this unless a few people can confirm that they have completed the process successfully.