Running the preview now. There are some bugs, but honestly it's fully useable right now. Just some graphical glitches so far. As for FFXIV, runs just as good as it did in 8.1 (which for me was a performance increase over 7). No special tricks, just installed DX9 and then FFXIV and it works like a charm. On a side note, so do all of my other games. Steam opens just fine on it, as does origin.

@Freyt: I haven't had problems such as those. My Mail and calendar still work even after the recent update. I have seen some graphic glitches, such as windows drawing slowly, but other than that it's been pretty smooth. Never even noticed a text problem tbh.