I've never heard of a "complete" Ayler box. His stuff came out on too many different labels (Impulse, ESP, Amercia, Freedom, Shandar, etc) for that kind of a collection.
If you're refering to the Revenant box, it's great but not anywhere near a complete set of his recorded works. Then again, that was never the point. B-)
I'd not start with the Ayler box, I'd get Witches and Devils (1201 Music), Spiritual Unity (ESP) and the complete Greenwich Village set (Impulse!) first.