Although my rose-tinted glasses are off, I think, as far as Google is concerned, I was interested in the Plus service. So I got an invite and joined the Field Trial when openings were available (I was told 21-23h Eastern Time Zone is ideal).
Before you wade through my juggernaut-ish train of thought, I thought Jack Yan summed up privacy concerns about Google Plus pretty well. Although Google repeats “Don’t be evil” almost like a religious mantra, they are a corporation, and the bulk of their revenue is in advertising. I can’t say I’m surprised, but follow Jack’s blog further if you are curious on how Google follows its privacy policies in practice.