[jorvi]

My conversion went fine, but there were so many misaligned sectors and constant strange checksum errors (on files written after the conversion). With the cherry on top being that if there’s more than X% of checksum errors, btrfs refuses to mount and you have to do multiple arcane incantations to get it to clear all its errors. Real fun if you need your laptop for a high priority problem to solve.

Lesson learned: despite whatever “hard” promises a conversion tool (and its creators) make, just backup, check the backup, then format and create your new filesystem.