> release-upgrade can be either perfect or very painful. This seems to be in the nature of the task. Freebsd-update is also often perfect, but if it goes wrong

> release-upgrade can be either perfect or very painful. This seems to be in the nature of the task. Freebsd-update is also often perfect, but if it goes wrong it can be very painful as well. On the other hand, you do have a rollback feature, but then you're back to a probably working, outdated system.