Hi BOAC
I think I remember reading similar posts around late November.
I bought a bundle of PClin$ DVD disks along with my new DVD writer. I had quite a lot of problems in trying to back up my pc and after many hours the backup would fail. (Almost warrants a DVD Vs External HD backup system discussion

)
I re-visited my local store a few times for advice / info, and finally got talking to a helpful chap who seemd to have an idea and understanding of my difficulties. During our discussion, his expression changed when I mentioned the brand. He - politely - suggested they would be suitable for some of the less important data one might have, but recommmended alternate brands for other important tasks.
He in fact agreed to accept a return of the disks and allowed a full price credit against a branded set of Phillip$. They have worked ok so far, so I'm hopeful.
It was a lesson learnt - early on - thankfully, but I will be bearing it in mind for future purchases.
Of course, I am assuming they are just as branded......