The Bonafide Buffer is meant to be used first in the signal chain to help normalize the signal, putting it at the end of the signal chain would not make any sense and defeat its sole purpose in ensuring the tone of your instrument to amp (or your core sound) is unaffected and uncompromised by any other pedals or cables that exist between.

For more information please see this very interesting video here which details the profile of the pedal and its application: