like dolphinius, I don't have to much faith in doing KProbe testing with Lite-On's DVD-ROM drives. Some of them might give results similar to CATS, but the consistency isn't there. Not that they're consistent with Lite-On's DVD writers either.. but you get the idea.
Personally, I wouldn't mind ditching KProbe altogether but the tool is widely used and people like to compare the results to their own.
You sounded as though you have lost confidence with all Lite-On drives for disc quality testing, even to the extent of doubting your earlier reviews, which used Lite-On 832S as the testing device. IMO, things are not that bad. On the basis of the behavior of 832S and other information, the PIE/PIF counts reported by it are not far from those by CATS. I would agree if you say that the later models of Lite-On DVD writers are not to be seriously considered as scanning devices. Sony 710A (but not the corresponding Lite-On 1633S) may be an exception, though.
As to consistency, there are also some cases where Benq 1620 and 1640 differ greatly in the PIE/PIF levels they report. Besides, Benq drives and recent models of Lite-On writers are too forgiving in their PIE/PIF tests. So we have only very few choices left. I would have suggested Plextor 712 or Lite-On 167T, if you had either one. I have two units of Lite-On 167T with different firmware versions, yet their scans are essentially the same. But Lite-On 166S is also acceptable to me. Since Optodisdc is a relatively new company, that may be the reason why their discs are not compatible with an earlier reader such as Lite-On 166S.
IMHO, it is better not to say that Lite-On DVD-ROM drives are not suitable for PIE/PIF scanning just because they are not comparable with Lite-On writers in the results, since different models of Lite-On writers may even vary greatly in this aspect. I found that this opinion seems to have originated from a post
elsewhere. But at that time, Lite-On is the only company to offer drives with PIE/PIF test capability. Moreover, I have Erik Deppe in my support, for example, see a post
I do not have discs from many different makers, but my observations may serve as a starting point for further investigations to either verify or disprove my views.