I just got mine, a Nec-Sony-Optiarc AD-7203S ("S" means SATA) and says "made in China". I didn't thought of checking right away at the store.
After powering on my machine I heard some strange sounds. The same sound is heard each time I press the button to draw the tray back in. It is probably the "natural" sound of the device, but that sound along with "made in China" gets me into some worry :-/
So, where is your NEC-Sony-Optiarc manufactured? And how satisfied are you from it so far? (quality of burns)