it uses flashcubes, not magicubes. bulb flash is f-sync indeed, and it wouldn't work with an ordinary mechanical shutter. but obviously the electronic shutter of the polaroid opens immediately, so it catches the electronic flash. marty kuhn did quite some research on his wonderful site
which is a "must" for polaroid owners. it worked well with the older pack film cameras. afaik they changed the cocking system of the shutter with the newer cameras, but they kept the electronics mainly. we only will know for sure if somebody tries and reports back to this page.