Last night I received an invite to +. I accepted it set up a quick account and invited my son, an autistic hacker (no not the one in a British jail) who is really "l337" and my wife who is an advanced user. Before I could get any more invites out Google shut down the invite system as they were overwhelmed.
My son set up his profile instantly, my wife is still working on hers.
The "circles" concept is huge. One of my gripes with Facebook is the level of openness I have with some of my "friends", but hey we're all "friends" right? With circles I can use the standard "acquaintences", "friends", "family" or create my own "my masonic cult that is really ruling the world." I can control the sharing.
If the invite system opens back up I hope to squeak a few more out, the other features look neat but I have no one to try them with.
I don't know if Google will dominate with this but I think they are going to make a dent on Facebook. Mashable hinted that Zuckerberg had a + account already. Maybe some needed changes will be made to Facebook.
Dave