What's your review about 'Kumon Philippines'?

My previous bosses' daughters are regular to Kumon tutorial/ learning sessions. They said super helpful daw talaga kasi the teacher-student ratio is great so tutok talaga sa bawat student. The only downfall they feel is it's super strict when it comes to homework and they feel sobra na kasi may real school homework pa so na-exhaust yung mga bata. And pag may na-miss out na day or homework talaga tinatawagan yung parents.