Ver. 6 and 7 compress into smaller archives. Expander 7 works sweeter in MacOS X. I use OpenUp for ZIP files as it handles long filenames and paths better. Remember, you don't need to pay for an upgrade on the Expander. I'm waiting for some serious problems to be fixed before I upgrade my Stuffit Deluxe. I'm using MacOS X and ver. 7 still hasn't resolved long filename issues and MagicMenu doesn't work in 10.2.1.