I got my Plumax 5.25 combo USB/1394 today. The original firmware in there was 2004.02.12.062 with 20 MB/s using 1394, which I updated to 2004.09.07.162 with 21 MB/s using 1394. Both USB was only 14 MB/s. I believe the limitation is the VIA-based 1394 PCI add-on card. But since I only have a LiteOn 812S@832S in there, the burst rate is good enough, as I'll leave the 16x burners internally. I had to use the firmware flasher 2.0.4 since 2.1.4 errored out trying to update.