I've only just gotten Windows 8 on my new laptop which I got last week.
There are still a few hiccupy moments in it, but I'm getting used to it.
I had to disable that thing that opens up when you slide your cursor near the right though, because my laptop doesn't have a scroll function, and I always catch it when scrolling down webpages and it really pissed me off.
We'll see how windows 9 goes, but I probably won't end up using it on my own personal computers, should I be lucky and continue to use this one for some time.