I spent most of the day upgrading PCs to Windows 10. It looks a little bit different, and is maybe a little quicker but it was basically painless. I did take the time to get the Aten KVM switch on my desktop to work properly - I'd never bothered thinking that the Windows 10 upgrade would fix it. I had to stop it doing mouse emulation (scroll lock, scroll lock, m, enter) so that the Logitech unifying receiver would work correctly. On the plus side, it seems to switch a lot faster (not that I ever seem to run both systems at the same time, but if I did...).