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For what it's worth, Coinbase has no reported cases of fraud. We are tracking these kinds of things here:

http://howdoyoubuybitcoins.com/

For example, Bitfloor (which had 250K USD stolen): http://howdoyoubuybitcoins.com/from/bitfloor/

Verses Coinbase, which has no such history: http://howdoyoubuybitcoins.com/from/coinbase/