Windows 8 it one of the most controversial OS releases since vista. "The interface formerly known as metro that I think is now called modern," or TIFKAMTITINCM has replaced the start menu and begun to invade the desktop.
Windows 8 is faster in almost every single way.
Metro looks cool(some disagree, I think that's a personal preference)
Works on tablets too
Cheap!- $15 for special upgrades and ~60 for a copy
old laptops without windows 8 touchpad drivers are screwed
Metro is wonky(search mostly)
No start orb(start8 by rocketdock)
UEFI boot is another attempt to kill linux
it transmits data to M$ constantly
Ill give a full review sometime soon, I just wrote this while It's reinstalling (I hate old dell laptops)