I waited till the last minute to upgrade to a Win10 computer, as my Win7pro computer was running just fine.  I chose this computer because it's made by the same manufacturer as my other computer, off-leased (fairly new in my definition), and  preinstalled with Win10pro (the main reason I am getting a "new" computer).I was pleasantly surprised at the clean appearance of this 'used' computer.  After hooking up the wires and started the computer, the Win10pro was activated without any issue following the simple instruction that came with the computer.  Win10 recognized and installed the drivers for my 10yr old laser printer, along with a few other peripherals,.  The computer runs and reboots (when needed) very fast.  I actually try putting a tissue strip at the fan exhaust to test if the fan is running as everything seems to be so quiet.All in all, I am very happy with this purchase.