I don't use it.

The loss of privacy is unacceptable. Imagine PAYING a peeping Tom to watch over your shoulder !
Yes, I know privacy on the internet is a myth, but I am not going to pay somebody to violate it. There are opensource alternatives to Google for the budget constrained. This is more acceptable than the Google option.
The bottom line is: Every privacy policy I've read to date says: "we'll do with YOUR information whatever we bloody well want and there is nothing you can do about it !! Furthermore, Google's latest usage policy change proved that "we'll do it retroactively too if it suits us".

The bottom line is: No privacy policy is worth the screen space to display it. Consequently I'll never even consider the Google apps option.