Here is a question about an attempt I am considering to apply one of the feats in this book to a non-legendary medium. As written, the only feat in this book that could be applied to a non-legendary medium is Spirit Focus, which is basically the same as the original feat by that name except for its "Special" line that allows it to be taken more than once, choosing a different spirit each time (and thus a slight powering up of the original feat).
The benefit section of the Dilettante Medium feat reads as follows:
"Benefit: For the purpose of determining the effects of your spirit, spirit powers, and spirit bonus class features, you may use your legendary medium caster level in place of your legendary medium level so long as your total effective legendary medium level does not exceed your character level."
Would it be overpowered (by the power level set by the standard medium class) if I struck every occurrence of the word "legendary" from this paragraph so as to make it applicable to a non-legendary medium?
I think it would be fine. The regular Medium doesn't really outdo the Legendary Medium in any regard.