Welcome to CDRLabs, tdesi!
I have the KHypermedia 48x24x48. It came with the firmware D.LC. I upgraded to D.UC, which is available at http://www.benq.com
. It added Mt. Rainier support, and it didn't even carry the risk that overclocking carries. BTW, I have heard that it is possible to overclock this drive to 52x, but the speed difference is so small that I didn't even consider doing it.