I’ve burned around 1000 CMC discs and they burn great for me, always have. This includes several hundred 2.4x discs and about 200 of them being burned at 8x on my NEC 2500. I’ve used CMC from HP, Memorex, Philips, Khypermedia, TDK, Imation, ESA, and others. I scan ALOT of my discs with PI/PO tests and transfer rate tests and I can honestly say that they have always been great discs for me regardless of brand on all of my burners - NEC 1300, NEC 2500, Benq 822, Benq 1640.
Discs playback find on standalones, PI/PO scans are great, discs have not deteriorated at all. I’ve read some crap burners can struggle with them, although it is often resolved with firmware upgrades. But it still amazes me that so many people bash CMC, they work incredibly well for me.