This was the first worthwhile translation of The art of war into English, and in many ways it remains the best. Certainly it has been the most influential. Even after a dozen other translations had appeared, Dr Joseph Needham still considered this the "standard" version in English. (Science and civilisation in China v.6, 1996.) In fact this translation is so important that the first edition (1910) has reached twelve thousand dollars in the rare-book market. (Jaydillon com, 2003.) If you're serious about Sun Tzu, then this is the version you want.