I absolutely love Google+ it is such a clean and intuitive interface. Circles are perfect for someone like me (and most people) that like to filter who they share what with. Sparks is a very unique idea and I've already added a few. It is easily tied in with my other Google services (Gmail, Youtube). I love using my phone to talk to my closest friends in huddles. And I can't wait to try out the hangouts feature sometime soon. (KHI should use hangouts instead of Skype from now on!)
Lastly, I'm tired of Facebook. I'm tired of the people on it. I'm tired of the attention whoring. I'm tired of the stupid apps that should up on my wall and feed. I'm tired of the shitty ads (although I'm sure G+ will get them eventually, it is how google makes its money). I figure the type of things I hate on Facebook are easily filtered out on G+. (Not to mention that the types I hate on Facebook are probably not interested in G+ in the first place: you can't attention whore by making sure everyone sees your publicized life, you cant e stalk and make sure you know what everyone is up to, you can't force people to add you by adding them, and plus, by switching over to G+, you lose all your precious "Friends" and tagged photos. Those whores aren't going to make the switch).
All that plus the fact that Facebook's privacy settings change every couple of weeks (and always default to being as open as possible) are reasons why I've almost exclusively spent my time on G+ since I got my account (I've barely spent over 30 minutes on Facebook this past week).