Would you use to Facebook's new e-mail service as your primary e-mail address?

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Just two days ago, Facebook released its unified "Social Inbox" where all the Facebook messages will be aggregated with e-mails. Yes, every Facebook user can get an example@facebook.com email ID. It was a rather daring move for Facebook to release an e-mail feature, given the massive prominence of e-mail providers like Gmail, Hotmail or Yahoo. But it could be a winning move too, given the oceanic 500 million subscribers that Facebook has. But would you really want to use Facebook for sending/receiving e-mails on a day-to-day basis? Would you shift your primary e-mail address to their service entirely ?