I have a Apogee Duet I that is functionally and cosmetically sound. It will come with the breakout cable for guitars and mics and a firewire 400 to firewire 800 cable. So the duet will work with later versions of macbooks with the Firewire 800 port.
*This will not work with USB, Firewire is a completely different interface port specific to Macintosh products.
If you would like to buy the duet please pm me.
Edited by genesyndrome - 1/2/14 at 8:00am