Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective

I've used a little over a quarter of these so far to burn CD's, and easily 7 out of every 10 will not play in a Sony personal CD player, which I use the most, or an LG DVD/CD player. I've tried changing the burn speed, but to no avail. I've never had problems with Verbatim before, but this batch has put me off. It's just not worth the aggravation. I'm returning to Sony and hope its CD-R's remain trouble free.