I posted a thread, some time ago, where I did a full test on these disks (and posted scans) using my NEC 2500. Here’s the thread I’m getting similar results with my external 3500A.
The bottom line is, if they work for you (with your set-up) then other people’s experiences do not really matter. I get better results at x4 than x8 - having said that, the results from x8 are more than acceptable with no read error whatsoever - which is more than I can say for the Riteks (quality control issues with Riteks I guess). I used to use Riteks - but since the Greys were released I’ve stopped using Ritek completely and use nothing but Greys (on my NEC burners) can even burn two at once with no problems.
Out of 100s of burns I’ve had 2 coasters - and they were when I first connected and tested the external 3500A - probably down to me and original settings. No problems now.
I’ve found that the Greys are more compatible on stand alone DVDs than Ritek - 2 or 3 of my friends could not play the Ritek -Rs but have no problems with the Greys.
Here in the UK the Greys are really cheap - so, for me, it’s a win-win situation.
Endnote - When I first started burning (using Riteks) I would K-Probe every disk and test for read errors (anal retentive or what!!) - the Greys are so good that I rarely do this now - maybe once every cake box (25). I still K-Probe and read error test for a friend of mine (he uses Ritek -Rs x4) still seeing problems.
As I’ve said earlier - it’s down to the individual and his/her setup - “if it plays - it’s OK”.
PS My Lite-On hates these disks and there doesn’t appear to be a FirmWare hack which will improve the situation. Again - this proves that setup has a lot to do with people’s experiences.
Hope this has helped