We too installed the eval on one of our desktops (was Vista) & are enjoying the experience. It seems much more refined than the beta I installed on my laptop a few months ago.
We like it so much that if we can get 3 upgrades for the $39.99 each that has been mentioned then the 3 desktops in the house will move to 8 & the laptop will remain 7.
Many thanks to tizmeinnit for mentioning start8

good find mate