Been using it for a few days, had a few issues which I didn't get with Windows 7
When I exit a full screen 3d game, the desktop is unresponsive, I have to ctrl+alt+delete and log off, then back on, to make it work again
Seems to happen about 25% of the time, it's annoying heh
End tasking Explorer.exe and restarting it doesn't seem to work either.
I hate the fact Windows 8 defaults opening things like Videos/pictures to the full screen, tablet type interface, but fixed that by installing media player classic and assigning all images to Windows picture viewer.
Speed wise, shutdown is a lot faster, my computer shut off last night in about 4 seconds, startup is faster too
General use is hard to tell if it's any better, my machine is a quad core I5 processor, with 2x Agility 3 SSD drives in Raid 0....oh and a stupid amount of ram (32gb....it was free, that's why
)