I believe someone mention the C't scans did weight Kprobe errors very high.
That may be, but I've been looking at some of OC Freak's Kprobe results in his review and it doesn't jive with c't's results. Here's another one - c't rated the Nu Tech writing to 4x Verbatim/MCC DVD+RW discs at -329 which is really bad and gives the impression the Nu really sucks at writing DVD+RW. However, check OC Freak's Kprobe DVD+RW scans here and the scans are actually very good and not as horrible as a -329 ranking would make you think.
Another factor from OC Freak's review was that even when he got bad Kprobe scans on low quality -R media that wasn't certified by the firmware, the disc was readable even though the Kprobe scan would suggest the disc shouldn't be.
While the Benq is obviously a good drive, IMHO there's enough other info to refute c't's implication that the Benq blows the Nu Tech away in write quality.