1. Did you upgrade after the release of Windows 10? (Jul 29th)
Waited a few days after.

2. Did the game start with zero issues?
no issues

3. Running DX11 version of the game just fine?
yes

4. Noticeable changes? (Game wise)
Running smoothly than before (windows 7)

5. Personal experience you would like to share about it? (Windows 10 / FFXIV with W10)
Only issues I have during the game is when teleporting/zoning games freezes up during the load screen sometimes and crashes or it just takes longer than usual to load.
Does anyone have the same issues or know any possible solution to this?

Edit: 6. Did you follow up with a clean install after the upgrade?
no