I installed my KHypermedia / Cyberdrive last week and it is working very well. I also have the KHypermedia / BenQ in my other machine.
The Cyberdrive burns better at 8x. Although I have DMA properly enabled on both machines, the BenQ buffer keeps dropping to very low levels (even though Nero's buffer is always full). This doesn't happen with the BenQ when I burn at 4x. The Cyberdrive, on the other hand, even though it's on a much slower computer, has a 93-96% full buffer constantly, even at 8x.
I have a bunch of Optodisc DVD+RW discs that the BenQ doesn't like very much, but the Cyberdrive burns them fairly well.
I flashed the Cyberdrive with the dual firmware before I used it. I had put the dual firmware on the BenQ a few weeks ago.
Overall I think I like the Cyberdrive better, although it doesn't allow proper PI/PO error disc scanning like the BenQ does.