I know the basic difference in these two is that one is capable of burning faster than the other. But why would they use the AZO dye in the 16x and not the 8x? Is it just to keep at least one type of Verbatim at an always reasonable price? It seems the AZO alot of times is the reason some discs are so expensive. Does a disc w/ AZO dye supposedly last longer? I like the 8x and 16x but if I knew the 8x were equally as good as 16x, I'd just buy them when they were on sale for $19.99/50 pack at places like Best Buy. I only burn at 4x, so the speed isn't an issue.