I have tried every Preview and the Eval RTM version, and I have decided not to upgrade. I am strictly a desktop user - have no use for touchy/mobile stuff. The Desktop side of Win8 is fine - and there are free and good Start Menu replacements to make up for that lack. But I, like you, am completely satisfied with Windows 7. And I think it looks better
No doubt my next computer will come preinstalled with Windows 8, and I will roll with it.
If I were you, I would stick with Windows 7. If you have the disk space and inclination, you might consider getting the eval release and trying it out, just to satisfy yourself that you're doing the right thing (otherwise you'll wonder...)
But I'm sticking with Windows 7 on this rig.