Well the performance of CD-R discs depends on greatly on the CD-R/CD-RW writer. Memorex 80 min disc fail when writing with a Philips CDRW 804, but TDK seems to work w/o many coasters. Imations are ...
I believe those are just standard Mitsu chemical discs, they make them all in Taiwan. If they're Datalife Plus discs, they're fine. Just dont burn them much above 24x ...