***Finally*** they've arrived, and yes they work. I shipped off the first 100 discs today. The shipping is a bit slow since 75% of the orders are international and I have to fill out a customs form for each disc. But they're on their way, and all 1,000 discs should be sent out over the next few days. Very sorry again for the delays. This was a real learning experience, but at least now I have lots of extra discs on hand and know exactly how to get discs replicated next time.