I've upgraded all of m machines to Window 8 and Office 2013, being able to use native multi-touch across RDP was the clincher for me, so I use my Surface RT as my primary compute interface for all of my work machines and servers...
I pretty much echo what the others have said. The "split personality" of Windows on a non-touch machine is not as bad as reviewers have made it out. I still haven't broken all my old Windows habits but the fact of the matter is Windows 8 works great and going to where the Start button used to be (the lower left corner) still brings up Start Screen which acts the same way (to launch apps).
If you want the killer feature Jeff nailed it. Installing Win 8 Pro on a PC will allow you to RDP into it and have first party touch support. This essentially turns your Surface RT (or other Windows touch device) into a full desktop PC. That is a power that shouldn't be underestimated.
yeewiz, you can check Win 8 compatibility here: Windows Compatibility Center: Find Updates, Drivers, & Downloads for Windows 8, Windows RT and Windows 7