I'm weary of "Store in iCloud" mainly because I have files in my Documents folder that other things depend on. I don't want things disappearing when I don't know it. Like coding projects. I have more than enough space on my SSD. I even upgraded to the 50GB plan.
I'm still confused as to what it's storing. "All files?" Will it store gigs of movies and photos without counting against iCloud storage limits? I find that hard to believe.