So I use the DVD from Verbatim now for over a 3/4 year where I need about 40-50 blanks per month.
As I used a burner NEC and had until now never had a problem with this.
Also months ago 8 Discs burned, I can still easily read (both on the PC and on the notebook).
When burning speed I used at 16x blanks max. 8x (as it is just recommended in all test reports)