I tried win8 since summer and everything ran ok. Except for:
IE 10 wouldn't load my Banking info.
PSP didn't work
Windows phone wouldnt sync to win8.
Mobo drivers couldn't install.
Printer drivers couldn't install
Other misc programs wouldn't work
Wait a minute, I guess everything DIDN't run ok. I didn't mind the metro, and eventually installed a start menu to make it easier, but when my most important stuff didn't run, I was actually forced to re-install win 7.