Except for individual file/directory defragmentation on demand, there are no new useful feature since its 8.x version. Unfortunately, its defragmentation on demand feature is just a workaround feature rather than part of the main defragmentation...
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3rd and sometimes 4th place for compression strength. And has no difference with version 2.5, just interface bugfixes, better looking and better file handling. WinAce fans should get it, otherwise don't. Oh I almost forgot. It also eat more memory...
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