I have long been a PC user, not because I like Windows, but because it was cheap, and Windows was functional enough for my needs (really prefer the fine grained control I get with Linux, but Linux and Laptops have never really played nice.
but I recently bought a new laptop for my wife, which sadly came with Win8. The laptop itself is a wonderful, solidly build Lenovo ultrabook.
Windows 8 makes it damn near unusable. the touchscreen oriented tile interface, the singletasking everything full screen all the time Metro interface all of it is garbage. might be good for a phone or tablet, but positively counterproductive on a laptop or desktop. I had to spend a fair amount of money and time finding and installing third party software to at least partially restore Win7 levels of usefulness
if the next release of windows doesn't restore Win 7 levels of usability, we will bite the bullet and spend the money for Macs.