It's somewhat understandable that Apple had to redesign the Magsafe adapter, considering the engineering wizardry they pulled off with the Next-Gen MacBook Pro. But to use an Apple display or older MacBook power adapter to charge your next-gen MacBook Pro or new MacBook Air, you'll need to kickdown $10 for this little thing, which just seems like an accessory waiting to be lost. [Apple]
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I'm genuinely surprised that they offer this. Nice that they did, but I'm still very surprised.