DD6's school uses Sweetie's method, but honestly the two teachers she's had since her schooling began have been the worst spellers. I'm constantly shocked that teachers can be such bad spellers. Eg, "piolit" for "pilot".
DD also writes stories about things teachers have no knowledge of - like geocaching, which DD spelled perfectly and the teacher tried to change to "geocoaching" then "geocatching" and DD had quite a job convincing her she knew what she was doing without any alleged help.
Anyway, although she's still mostly in the 'creative' spelling phase, DD comes from a long line of awesome spellers and the teachers have a big enough list of sins in my eyes, that spelling is not on my radar
