I'm not really happy with preferring their opt-out setting when I've already made an opt-out setting in my browser. I don't believe for a moment that Apple or Microsoft care about my privacy any more than Google does, but if I've made a choice and communicated that via browser settings, I expect information providers to respect that choice and not try to exploit the browser in an attempt to bypass my choice.
If you truly care about your privacy rather than simply making a political statement, use something like Ghostery (http://www.ghostery.com/). Even if some of the big companies care enough to respect a request like this, I assure you that the majority of tracking services will not.
If you are making a political statement, then that's fine, I agree that all companies, Google included, should do far better on privacy grounds than they already are.
