Wife has a laptop with 8.1 on it. She absolutely hates it. Enough that she had me put linux on it in a dual boot setup. Now she uses linux for most things, and windows only when she has to. She wants to go back to the simplicity of one OS though. Thinking about buying a copy of 7 outright, wiping everything and starting from scratch. 10 is kind of that dark horse, do I dare risk it, or would she hate it as much as 8.1....
If she doesn't use the 8.1 dual boot anyway, might as well given 10 a shot and upgrade it. From what I hear it's only uphill compared to 8.1, as long as you don't have an upgrade problem. And I haven't heard about many issues there as long as the computer is 3-4 years old max.
I plan to upgrade my wife's 8.1 laptop to 10 soon. But I'm waiting until the first patch release, which sounds like November. If it goes well, I'll try migrating my 4 desktop Win7 machines next, but only after doing a full disk image backup before the migration so I can recover to where I was if there's an issue.