My prof. used them for our course. We all showed up with different editions (purchased at used books stores and off the internet), and it was funny to see how they had changed details. I won a prize for my dramatic reading of the paragraph from my circa 1970 edition explaining why modern rock 'n' rollers just don't "get" Gregorian Chant, and why they ought to.
My husband’s Counterpoint teacher, Hugo Norden of Boston University, wrote the “counterpoint” section in the Harvard Dictionary of Music.