This info was from the Galen Carol Winter 2008 newsletter:
[the CDSA] has been updated with a new German-sourced drive mechanism featuring stabilizing rods for the sled assembly and an all metal tray. These changes make for a more stable and quieter drive, and loading is smoother and faster as well. Cool custom machined isolation feet have been added that both improve performance and improve visual appeal. [A $1500 upgrade is offered.]
[the CDSA] has been updated with a new German-sourced drive mechanism featuring stabilizing rods for the sled assembly and an all metal tray. These changes make for a more stable and quieter drive, and loading is smoother and faster as well. Cool custom machined isolation feet have been added that both improve performance and improve visual appeal. [A $1500 upgrade is offered.]