GTalk introduces invisible mode. Good or Bad?

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Last day after watching a screenshot on Orkut in one of my friend's photo album, I quickly swtiched to my Gmail window and there it was.. an option to hide my online status on Gtalk..from Gmail window. Google GTalk Team has finally introduced invisible mode for Gtalk users. Presently it is only available inside Gmail window. But we believe it'll be available in GTalk's next upgraded version and also in GTalk Widget. But features comes at cost and with debates. So what you humans think of this new feature on GTalk. Now your friends can hide themselves from you and vice-versa. For us it is a good feature to concentrate while working. And for the question of friends, we don't believe that true friends needs to hide anything. Any Comments are welcome and appreciated. aj