Nothing other than the black with gold hardware and the limited edition logo. It was the second (or fourth depending on how you count) of a limited edition series, starting with Buttercream in 2005, Black/gold 2006, Blue Dawn 2007, Sequoia Gold 2008. (Envy Green and Radiance Red, both with painted black headstocks and gold lettering, were offered in 2004 but were not official limited editions). After that started the BFR (Ball Family Reserve) instruments, and then came the PDN instruments.