Instruct: Classify a review as either positive or negative.
Query: Flagging Quality

I've been buying RiData/Ritek media for several years now (many hundreds of discs) and, up until recently, have been quite happy and have had no problems with them. Now it seems that their product quality is slipping. The last two batches of these DVDs have had about 20-30% defective (visible spots on the disk). I'm moving on to a better brand.