The only reason I installed it is because it's free xD
The last thing I need to buy is Office since I rarely use it, and mostly Word, but I used the 2010 beta until it expired, then occasionally used WordPad on 7, and now I can use Word 2013 until it expires, then back to WordPad xD
Besides, the most important documents, like my CV and PDFs (i.e. docs that don't need to be edited), are designed in Photoshop xD
But all in all, the 2013 version seems all about SkyDrive and cloud syncing, which isn't really that bad if you take the time to make those files private. Having those docs available on any device that supports SkyDrive means that I can keep, for example, my CV in my pocket instead of printing it out and carrying it with me to a job interview or something. It does get handy, but aside from that, I don't really see anything too appealing in the 2013 version.
Blinding, yes, but not appealing. I installed 2013 and opened Word to activate (barely found it by the way xD) and wanted to continue on writing a story I've been working on for some time. Five sentences later I had to look away for a moment and blink a couple dozen times - it gets awfully painful on the eyes to watch all the white.
COLOR SCHEMES Miscrosoft, PLEASE!