I bought this from Apple about 3-4 months to use with 17" Macbook Pro and a 30" Cinema Display. Tried it out and worked it fine, but disconnecting the cables form the Mac Pro, connecting the converter, the Macbook and then undoing all that to reconnect the Mac Pro was a pain-in-the-butt. I it did once and haven't used it since. These sell new for $99 at Apple. $60 paypal'd and shipped in the US.