i think the ones in usa are ok. however, in the uk and europe the quality seems to be variable. im the uk, i ordered 25, burnt 13/13 coasters. ive stopped using them now, cuz its no point. but i know a few guys from usa ordered these and they were very very impressive.
the disks i have are Bulkpaq printable, white top, Prodisc DVD+R R02. people in the usa, using identical media code disks, have had great results.