My daughter had a laptop with Windows 7 Home on it and did the free upgrade to Windows 10 when it first came out. There were problems (don't remember what they were) so we reverted to Windows 7 again.
My current PC has Windows 7 Pro 64-bit. I left the room tonight for a few hours with the computer on. When I returned, Microsoft had initiated the upgrade to Windows 10 without my permission (I'm assuming there was probably a message giving me a certain time to opt out before the install). So I declined the agreement and it took a few minutes to change my system back to Windows 7.
Should I be fearful to upgrade after all this time? Have most of the bugs been ironed out? Are there any advantages/disadvantages to using Windows 7 vs Windows 10? I'm happy with my PC's current performance.