The present edition is a combination of the fifth edition by Dudgeon (the 1893 revision) with the sixth edition by Boericke. Essentially, one can see the changes that Hahnemann made to the text of the fifth edition. An appendix outlines all the changes made from the fifth to the sixth edition.
Of all the published editions this remains the favourite, since it clearly shows the changes in Hahnemann's thinking as some paragraphs in the fifth edition were modified and others completely rewritten. This edition offers both versions interposed.