I randomly decided to install Windows 10 last week on a whim...and i Love it. -- i thought it would be weird/bad, but it's not. i don't miss Windows 7 that much, except a few of my older games don't work under W10...but that's not that big of a deal.
That's what I thought at first, it was relatively "smooth" for a couple of days until problems started to emerge..
Actually, it's been more like two weeks since i installed Win10...and I haven't encountered anything weird.
Win7 is essentially Vista, and Win7 is an excellent operating system. C++ code compiled using VS is very powerful. IIS works well. Unneeded services can be stopped. And the local network can be configured. I'm an old Unix/Solaris guy, and I find Win7 to be tolerable, which is saying something. I've stopped applying "Updates for Windows 7" since so many of those are back-door spyware mimicking Win10. My Win7 is stable and MS doesn't care about it anymore so there is no reason to believe they are "improving" it with new updates. By the way, if you set the Performance Settings to "Best Performance" (System->Advanced Settings-.Performance) your Excel will be twice as snappy, as all of the animations really bog it down. If your desktop is geared for performance, this is highly recommended.
I tried it again on 12/01/2015 and it went perfectly. Everything works as it did with windows 7 although I am still trying to figure out where they hid all the functions. I think it is "safe" to upgrade at this point.
Thanks for the heads up on monitor issues. I'm running an AMD FirePro V4900 with 3 monitors and a search tells me there are issues with it and Win 10. It's purely a trading rig, just need charting, brokers software and Excel on it; I'm perfectly happy with Win 7 Pro and see no reason to problem solve just to get 10.
Well, all was well for me until the new year update. Now my HP Pavilion 27xi monitor keeps going into and out of sleep mode. Tried uninstalling the update, but still have the flashing. Also not sure it actually uninstalled as it shows installed on one menu, but not in the list of updates. F***, I hate computers.
Windows 10 is arguably the most unstable Windows version in a decade. On the surface it seems rather smooth due to slightly faster boot up times. Then those automatic updates start up in the background... I couldn't believe MS let that piece of junk loose on the public. But then it's free, right? That kinda tells you that either (a) you are the guinea pig test bed until they rename it Windows365 and charge an annual fee, or (b) they make you pay from advertising that you can't turn off. My advice - back up your essential files to a couple of hard drives, buy Windows 7 Pro whilst it's still available and do a fresh install of Windows 7 Pro. Then turn off the Windows 10 updates and lock the thing down until 2020 when the Windows 7 security updates end. You could try the Windows 10 option to revert back to Windows 7 but that didn't work so well for me so I ended up doing a clean Windows 7 install anyway. Maybe in a couple of years it might make sense to upgrade to Windows 10 if they turn off all the unnecessary crap such as Windows Store, Edge, Cortana, etc. by default. Or for someone with Windows 8. Maybe there are some other benefits that I'm unaware of.