Is this the best free Microsoft Office alternative?

For over a year now I've championed Kingsoft Office Free 2012 as one of the top Microsoft Office alternatives for Windows, and with good reason: It's one of the best-looking clones out there, with superb file-compatibility to boot.
Yesterday, Kingsoft unveiled Office Free 2013 (Windows). (Please see below before you install it.) I'll go out on a limb and say it's now the single best free replacement for Microsoft Office, for a couple of very good reasons.

Choose between two Office 2010-style skins or a more old-fashioned interface.

In case you're unfamiliar with it, Kingsoft Office includes three modules: Writer, Spreadsheets, and Presentations. Needless to say, these aim to take the place of Word, Excel, and PowerPoint. For the most part they do an impressive job -- starting with how they look.
Office Free 2012 borrowed heavily from the old Microsoft Office 2003 interface you see in most other clones: LibreOffice, OpenOffice, and so on. Kingsoft actually did offer a more Office 2007/2010-like "Ribbon" interface, but to get it you had to spring for Kingsoft Office Standard or Professional.
In Office Free 2013, you can choose between "2013 Elegant Black" and "2013 Water Blue," both of which do a fine Ribbon impression. It's not an exact replica, but it comes close -- to the point where I'd call this the most attractive Microsoft Office clone ever. (Interestingly, you can easily switch to "Classic Style" if you do prefer the more old-fashioned menu-style interface.)
Kingsoft's product also does something that has somehow still managed to elude Microsoft after all these years: tabbed documents. Instead of having to switch windows every time you want to switch between multiple open documents, you just switch tabs. Another very cool amenity: a paragraph-adjustment tool that lets you modify indent and line-spacing just by dragging handles.