I came across this rather unflattering review from 1940 of Saint and Sage the English language version of the biography of the Chafetz Chaim by Moshe Yoshor. As you can see, it basically says about this biography what many people say about many modern rabbinic biographies.
Artscroll reprinted a version of this book, and can be bought here. I was a little suprised that Artscroll writes that it was "first published in Yiddish in 1937 and considerably enhanced in a 1946 edition, the biography was published in Hebrew in 1959 with much additional material" without ever mentioning this English edition.
Incidentally, I read this book (the 1937 English edition) years ago and quite liked it myself.
(click on photos to enlarge for easier reading)