Published Material from Oathbound Traditions?

What do you think about non-oathbound material published by people from an oathbound path?

* Do you think the given information is incomplete in a significant way, because oathbound stuff is omitted, changed or generalized? So is the material less authentic than material published from a not-oathbound path?

* Do you use such material, for example books by Gardnerians containing non-oathbound stuff (like Deborah Lipp Elements of Ritual?

What do you think about oathbound material published?

* Do you think it is authentic and useful?

* Would you use it or parts of it? Why/why not?

If you're from an oathbound path how does your tradition handle this question or how do you think it should?