Just a reminder to Bitcoin newbies: This card looks like an OK product (still open questions about how much coinbase is gaming the ask/bid spread) but just realize that this card does NOT use Bitcoin, it uses "Coinbase Bitcoin"[1] which is Bitcoin for which the coinbase company is managing your private key: You only truly own Bitcoins if you own the private key for the account (users of MtGox learn this the hard way…
Here we get into the distinction between ownership and possession. You own coinbase bitcoin the way you own the stocks in your brokerage account. You don't possess coinbase bitcoin the way you possess the dollar in your pocket.