You're one of the lucky ones. I will guess you'll be even happier with Win10. It's got all the good things about 8.1, and adds back some of the good things about 7 that were originally lost when they went to 8.
People who liked 8.1 are generally VERY happy with Win10.
A lot of people didn’t like the interface, especially the lack of a Start button. But you can download a free Windows 7 shell to restore that (which is what I did the first day). After that, no worries (and I am a heavy PC user).
How secure is Win10 though? I’m hearing that they share your network key info with other parties. Not sure exactly what they are referring to but that sounds like that’s what they’re saying.
A lot of people that absolutely hated 8/8.1 seem to be happy with 10, also.