<p>I upgraded from Windows 8.1 yesterday and it was really smooth. The only problem was that the bluetooth didn't work at first. I delete the driver, restarted and it worked.<br /> It kept all my settings, didn't change anything, even the folders I was working on some applications, like Capture NX-D, was the same after the upgrade.<br /> I was really used to the look of Win 8.1 and now the new Start is a little confuse but I'm sure it will be ok. It is not like win 7 or Win 8, just different. The rest is the same. The update tools is not on Control Panel anymore but in Settings.<br /> <br />A little tip is that the Control Panel seems to be gone at the first look, but it is not, just right click on the Start and there is a list of common tools, Control Panel, Administrations Tools and so.<br /> Now I'm trying to get rid of the annoying things, like the Cortana, and some pops.<br /> <br />I installed also on a little and old notebook and it is working great, a little faster, on my working laptop I didn't see any significant change on performance, Windows 8.1 was already fast.</p>