Win7 took over a half hour to boot up and become usable. Win10 just a few minutes if that.
Main problems with Win 8.1 were related to Adobe Flash I think - websites like dailycaller.com or freebeacon.com taking 5-10 minutes to load. Ridiculous.
I did get rid of IE11 and went with Firefox+AdBlockPlus. That may have been the biggest benefit when I upgraded.
But, anyway, I upgraded 2 desktops and 1 laptop to Win10 without any problems and am very happy with it.
Also, just as an aside, I had an Office Pro 2013 license, but decided to subscribe to Office365 because my wife has a client that uses it. Very happy with that product/service also.
One thing: the new Win10 browser (Edge) may not work with some sites you need to get to. (My employer’s SharePoint site in my case).
You can find the old IE11 browser (on a 64-bit system) at
“C:\Program Files (x86)\Internet Explorer\iexplore.exe”
where you can just right-click it and drag a shortcut to your desktop.
I don’t know for sure, but on a 32-bit system the IE11 browser is probably here:
“C:\Program Files\Internet Explorer\iexplore.exe”