I rolled back without issue only to later change my mind again and reinstall it. I think I read somewhere that the option to go back to Windows 7 via Windows 10 times out in a few weeks.

I think I read somewhere that you have 30 days from when its installed to rollback.
 
 

Win7 to Win8.1 I was surprised to see (as a skeptic) the overall CPU core balance was a huge improvement. I assume Win10 at least inherits this improvement from 8.1.

I liked Win7 but after that I liked 8.1 even more. I suspect the people who didn't like the start screen never spent an hour customising it to their requirements. It's much faster to start apps than win7 once you got it tweaked and you can avoid metro almost altogether.

Hope win10 isn't a step backwards here.

fireberd
 
I think I read somewhere that you have 30 days from when its installed to rollback.
 
 

Yes, you have 30 days/1 month to do your rolling back, after that you're locked in, unless you have a backup, or do a reinstall of previous version (hopefully) They do give you a message after the roll back saying you are welcome to return to Windows 10 anytime you like.