Welp, as far as differences go, fundamentally they are pretty darn close. Both are embedded "computers on a board", the CPU on the QM2000 is the Motorola Coldfire which has nice onboard DSP capability (similar parallel processing operations usually afforded only by ASIC/FPGA as used in the RSDI showlink), and lots of processing horsepower, The Flashback3, has an Atmel variety of the good old 8051. Both have onboard memory capable of holding a show. The QM2000 uses PC100 SDRAM which is many times faster than the Flash memory on the Flashback3, as far as how fast it has to be to load laserframes in real time, only Bill can probably answer that. The QM2000 has an "expansion connectors" as well as direct PCI Interface which allows hookup of an IDE CD-ROM drive like in the CD2000, or the QM2000.NET card, the Flashback3 has much more limited internal I/O and interface. As far as D/A, I didn't take the time to look at datasheets and compare the two, but the QM2000 has more channels, ie (8 color control for the QM2k, and 4 channels for the FB3), 12bit DAC resolution for the FB3, vs 16bit resolution for the QM2k, I can tell you the analog output stage on the QM2000 looks much more robust. Remeber the Flashback3 was designed to run any shows (cues) created on LD2000 as a standalone device, so by design its hardware must be capable, and similar in performance. I'm sure I am not 100% accurate here (after all I don't work for pangolin), and I will probably be corrected, but I think these are pretty close to the list of differences between the hardware platforms, the rest is all software on the PC.