I finally took the plunge yesterday and upgraded my primary desktop computer from Windows 7 to the new Windows 10. Initially I had intended to wait a few months to see how others liked it first, and to give Microsoft some time to work out the inevitable bugs at launch. But based on some initial reviews from my friends, I just decided to say "screw it" and went ahead with it. Though some people claim the upgrade took as little as 20 minutes on their computer, I would say on mine it was over an hour - about an hour and 15 minutes. The only major issue I ran into post installation was that my sound wasn't working at all. I was kind of freaking out over this at first, because after looking for some support on the web, apparently this was a common problem, and none of the remedies I had tried were fixing it. Eventually, someone suggested simply rebooting your computer one more time, and fortunately that worked. My initial verdict: I'm still really frustrated with how Microsoft moved a lot of core things around, to the point where I had to keep using their built in search function to find them - things like the Control Panel, Msconfig, Windows Update, and the Device Manager. I still don't know exactly where these things are located, but as soon as I find them I'm going to have to create my own shortcuts to them, which is annoying. The user interface is very plain, ditching most of the jewel tone 3D button styles and beveled edges of previous versions of Windows. If this makes Windows a little less resource intense as a result, I'm all for it. However in its current iteration, it does look a little rough around the edges. There are weird blue lines around various windows when they are in focus. It sort of looks like a beta/working copy of Windows. Not a deal breaker, but could use some work. The Start Menu is back, but the upgrade got rid of all the apps I had pinned to the start menu, so now I have to go rebuild all of those. The apps themselves are now broken down into alphabetical groups. I'm not crazy about it, but it's better than it being altogether absent from Windows 8. One thing I will warn you about, when initially upgrading, make sure you choose "advanced settings" and read through these options carefully - you probably don't want Microsoft spying on you with all these new features they are including. I opted out of practically everything - but they are likely hoping most people will just skip past this, so they can collect a ton of data about you.