I'm still waiting for the upgrade to be available for DoggyMama's computer. I did all the prerequisite stuff like converting from 8.0 to 8.1 and "reserved" her copy about a week ago but it's still not there for downloading yet. I'm waiting to see how it is on her machine before I make the decision whether or not to do mine (Win 7). The more I hear though, the less inclined I am to upgrade mine. I'd really like to try Linux, but I know nothing about partitioning my machine and running it in virtual mode, or making a bootable thumb drive, etc., so I don't have to commit to it.
For Linux, you can use something automated, like http://www.linuxliveusb.com/. It's about as easy as it gets and it'll download the ISO and make the boot disk all at the same time if you'd prefer. I'm using Linux Mint on a laptop (have been for almost two year now) and I really like it. I can do everything but game on it without issues and haven't put my mind to making it ready to game on...