I've been buying [here](http://www.nierle3.com/s01.php?cur=eur&sp=en&ag=1
), since a long time and sometimes I've seen they sell CD-DVD reprinted, which as once read here must be avoided as much as possible. But other times they offer some media branded as "AAA grade", "A+ Grade", etc...
Could anyone tell me which are the differences between them (if any). Well I suppose that AAA will be the best available, isn't it? The dye (Azo for verbatim, long life dye..) is also important, as the substrate (polycarbonate..) isn't it?