I have it. I understand it. I think it will take off very well--especially in corporate America where it can't be blocked since it is Google.
Actually, it can. I was thinking the same thing (and so far, my job hasn't blocked it), but somebody said that their job blocked it. It's either in this thread or on one of my G+ statuses. I can't remember who... maybe MM04? Idk... but yeah, somebody did say it was blocked.
If there's a way, my job will soon figure it out.