Yours seems to be about like mine was, but I got even worse scans when MSCE read speed was turned on, sometimes it even errored and stopped the whole process. But after many tests, stock firmware worked perfectly time after time. I didn't RMA mine either, a friend of mine bought it from me. He knows all about the "problem", but he doesn't give a crap as long as it works with stock fw, and it does work quite well.
I however do care. Unlike my friend, I bought this drive mostly for it's ripping capability (OK and writing too). Some people might say whatever just use it with stock, no big deal. But honestly it kinda sucks to read in a forum about how amazingly fast of a ripper it is, so I'm thinkin "hmmm, thats the ripper I want." So I buy it, get this problem, and then it's hard to return it (ethically) because it works with stock firmware. So, I'm stuck with a drive that I bought for fast ripping, meanwhile I have two rippers that kick its ass for speed already. Luckily my friend bought it from me, cause for what I bought it for, I woulda been throwing my money in a hole.
I think if I see these QC control problems keep happening with Benq, my next drives may be from someone else. You'd think after all those problems people had returning 1620's, Benq woulda wised up a bit. They have great hardware, but whoevers putting it together (in China plant especially) needs to get their heads outta their asses I think.