Kingsoft Office 2013 has totally changed its graphical interface to align with the new standards of similar products competitors, so it looks very much like the so-called "Ribbon" interface of Microsoft Office 2007/2010. However, you can also set the old interface similar to Microsoft Office 2003.
The software has a built-in PDF converter and an automatic spell check!
Kingsoft Writer Professional 2013 is fully compatible with Microsoft Word 2007/2010.
Input file format: (97/2000/2003/2007/2010) doc, docx & dot.
Output file format: (97/2000/2003) doc & dot.
Kingsoft Office 2013 exists in two versions: totally Free fo personal use, and Professional ($ 69.95). In this table you can see the differences between the editions.
[Source Link] Kingsoft Office 2013 Free
In my opinion the compatibility with Microsoft products has increased. In particular, examining some Excel file I noticed that some features such as Macro, notes and graphics, in the 2012 version were still partly incompatible, while in this 2013 version were fully compatible! Some Powerpoint files very large (with many photos and effects) are now handled correctly.
An other peculiarity is thas the suite is smaller (50 MB) and faster than most other office suites.