Just received a batch of 25 DVDPro 1-4X from supermediastore.com @ $1.55 each, free shipping, and the first 2 burns at 4X worked fine with about 3.6 GB of movie data. They read as FX Princo with ADVDinfo but they're not the same as the first Princo I used which only burned at 1X, and poorly at that. The first batch of 50 Princo had about a 10% failure rate with anything over 4 GB and the next batch of ACCU were even worse with about 1 out of 3 locking up with bad pixelation over 4 GB. Toward the end of the stack I was even getting failures under 3.5 GB. As compared to what I experience to date these look more promising ..... but who can say until I've finished with the 25. I'll report back when I'm finished .. especially if it's negative. My burner is a Pioneer A105.