In the bookstores:
Harry's books have sold over 1.1 million copies in 23 translations, and received recognition:
Ten Best Business Books of All Time (listed as number four; RateItall.)
The Four Best Business Books Ever, Drew's Marketing Minute (World's most popular marketing blog)
Best Business Audio Book of 2004 (AudioFile)
100 Best Business Books of All Time (2009 book by the same name)
Five Most Notable Business Books of the Year (2007 American Booksellers' Association)