Ok, just migrated my main sites to CP.
Just one had a little trouble.
The migration plugin don’t seem to check if it can overwrite files.
The plugin, during migration process, stopped with an error (something like) “can’t overwrite XXXXX”. Reloading the page a nice white screen. No problem for me, I’ve manually migrated from command line in one minute.
It could be useful to check file permissions before starting the process.