I have to agree with jo. My experience with DVD-R's is that they either work right away or they don't. The ones I burned 2 years ago (another generic no-name) still work. The ones that failed, failed right away.
I bought a 50-pack of these Starlogic's this afternoon at OfficeMax and I just burned one in my E100. No problems, plays in my DVD players.
They are labeled on the packages, paper label (Made in Taiwan, 1X speed). I see nothing on the package or disc's that indicate they are made by Princo? So 1 for 1, out of 50 doesn't tell me how the other 49 will be but it is better than being 0 for 1. But for 20¢ each, I can afford several coasters.
Dave