Kuhn's Structure of Scientific Revolutions represents a watershed moment in the study of the history of science. His terminology of the paradigm, and particularly the paradigm shift, have entered the popular lexicon.

Yet, as noted in three generations of reviewers (corresponding to the first, second, and 50th anniversary editions) the ideas presented in the volume have been controversial from their inception, ranging from accusations of vagueness, through circularity, to extreme relativism.

Of the responses to Kuhn's ideas which would you recommend as the best reading.