I'm hesitant to upgrade my main laptop (8.1) or media servers (7 Pro) to Windows 10, but I have a small travel laptop I let go ahead, just to try it. So far I haven't seen any real problems on it. I'll have to try installing some of my favorite programs and see if it cooperates. I've read mixed reviews about the upgrade... most have no problems, some have BIG problems!
Whatever you do, be sure to do a FULL Drive C backup, hopefully to an external hard drive, before you try it!
I will definitely make a HD- backup thank you for your reply, I'm still not quite sure lol I have read that there are great problems with Google Chrome etc ( I use Firefox 40.02) after the last update. what's about cortana ? do you like it ?