Ricoh DVD-DL blanks with some failure

with me no problem with the layer change. I have now a number of DVDs with movies and fully my somewhat older Sony DVD player plays these flawlessly from. The quality of the films is impeccable. I burned the movies with my Digital Camera Tool, it (not so with Nero) allow direct firing of the Cam on DVD. With Nero I've made only backups, but these are perfect. However, I had no problems with the Committee in the first batch. After I ordered again, some defective blanks were there.

Nero Speed ​​Test reports a RICOH Japan ID for EMTEC blanks.

The top of the DVD is printed, so not suitable for sebst-print, but can be well labeled.
The outer edges are very uneven. If you look closely with a magnifying glass they are put in the outer edges firmly small Maken and cracks. The question is therefore how long do these blanks?

If anyone has experience with these blanks on durability or quality differences with regard to different batches has, then write here.