I tried Google+ when it was by invite only. It was decent, but just not different enough from facebook to warrant me transferring all my pictures and information over and going through the trouble of tracking down all my friends again. I imagine this is the case for most people, and will probably be the reason why Google+ won't ever really supplant facebook.
I've been ignoring facebook for about ten months. I don't see any point in signing up for a new facebook to ignore.
I tried Google+ when it was by invite only.