I liked the idea of circles. I'm part of multiple social circles and what might be interesting for one could very well be meaningless for another circle.
The "circles" were awesome. It was a breeze to tweak your feed based on which circle you put someone in. Rather than get all the posts from a very hit or miss account I could pretty much say "only the top posts".
per post scoping was nice.
I didn't have to manually tag each account, just select the circle and publish.