We have recently purchased one and have had no end of problems with it.
We've tried it on two machines, both meeting and exceeding the requisite specifications, but it still won't work. Essentially, when submitting the job from the DVD software to the unit, it just sits there after imaging, saying 'waiting' with no other information. Opening up the System Manager, it shows that the job has been submitted (it's in the pending orders list, but just sits there saying 'pending' with again no other information). Tech support (European) has not been helpful at all, first of all pointing out that we indeed have a problem (which unfortunately, we already knew ;) ) and then the suggested solution was to reinstall the software which didn't change a thing. If any users out there that are reading this know of anything we can try to get this thing actually burning, I'm all ears.