[KaoruAoiShiho]

Last I checked User based analytics is directly against the Google TOS. You are not supposed to store any identifying information about specific users, probably because Google has been under privacy scrutiny. So not only is google not for user based tracking they prohibit it, making them a real non-starter in any case.

[duwip]

Check out the Google I/O video I mention in the article if you need convincing. As far as not collecting user data fo privacy reasons, I think brandon0's comment says it all.