It’s not that they [Verbatim-MKM-MCC] are really withholding the best media from the public; they just can’t support all the demand for their media in their own Singapore plant, and, thus, it got outsourced to CMC, Prodisc, and Moser Baer India. Many people still have great luck with discs produced by all 3. The only write-once discs that Verbatim still churns out from Singpore, as you read, is their DL, and even they are having to outsource that because of the [apparently low] production capabilities. However, there is some inconsistency, but that’s not saying that the discs will be trash–not by a long shot. I can’t say that buying from a reputable dealer known to carry only premium Verbatim will guarantee your happiness, but it will give you a good chance of avoiding a coaster.
For overspeeding, most drives only have the best of luck with Taiyo Yuden. But that does NOT mean that you won’t have good luck with Mitsubishi-Verbatim media. I have heard few, if any, longevity issues with either maker, really. It’s really up to personal opinion & if you plan to overspeed or not. Maybe try out a few of each, if possible. If not, buying premium Taiyo Yuden should leave you safe.
To be fair on the SH-S203B issue: the drive seems to love Taiyo Yuden, while MCC isn’t that hot with it. Comparably, the LG GSA-H55x series can only really do Taiyo Yuden at 20x with acceptable results. The same generally hold true for the Lite-On LH-20Axy/BenQ DW20xx series.