Lady Hillary and I have about 8 working computers between us. One is Win 8.1 which we will check out once we remove the password [Not as simple as it sounds as it's on a netbook], one is a Vista laptop and the rest are various permutations of Win 7. Three of the Win 7s are formerly XP machines.
In truth, we have had no problems with any of them except getting the password off. I suspect that the 8.1 machine will also be just fine. If the machines are running well, I do not believe we will migrate.
As I have said elsewhere 10 and 8 are for low capacity touch screen devices. As none of our machines meet this definition, why bother?
I happened to be at our local Office Depot and noted how cheap [in every sense] the new tablets and notebooks are in the store. This may be because everything has been externalized.