Broadway.com is a rave:
"It is impossible to imagine anyone but Antony Sher performing Primo, his masterful adaptation of Primo Levi's Holocaust memoir If This Is a Man. (A moot point, as it turns out: The Levi estate has forbidden anyone but Sher to perform it.) Along with director Richard Wilson, this superb actor has stripped the story of any filigrees; adorned only by devastatingly effective lighting (by Paul Pyant and David Howe) and sound design (by Rich Walsh), Primo has turned one of the 20th century's towering memoirs into a lesson in achieving theatrical greatness through simplicity. Sher is lucky to have the words of Levi, whose empathic voice makes him an accessible, even ingratiating guide to hell. And we are lucky to have them both."
http://www.broadway.com/gen/Buzz_Story.aspx?ci=514958