Windows 8 works... yet... The metro start screen is totally useless to me, as well as I really need a start button and a DVD playback. So I had to install a soft to skip the metro start and add back the start button, as well as I installed the media center to have the DVD playback.
Once this is done you get a fast boot, a bit snappier PC than windows 7, yet it's a bit more ugly (I don't like the simplified square look of 8), you miss also a few other small things but overall the difference is pretty much none. So should you do it? Honestly, if you have windows 7 running and you don't need to run any soft requiring 8, don't install 8.