yeah, i was tempted to go for a benq 1650 instead of the nec 4571, and probably would have had there been an easy way to flash them under linux.
i flashed my 1640 eventually after tdb gave me a .cvt instead of the usual .exe and a dos-based flasher, but that's not a sustainable method.
also, the software that makes benq good (wopc, qsuite etc.) is not available off of windows.
binflash works lovely under linux, and the firmware is always just .bin file