My experience with CMC:
1. With a good burner, such as plextor, they're okay. You will get decent burn quality, with relatively low/medium C1 errors.
2. In using CMC for Audio CD, I always have problems (skipping, etc). The only way I can use CMC as an audio CD perfectly is with Yamaha's Audio master quality recording.
Recommendation: If you find them dirt cheap, then get them. If not, Fuji's TY is much better for your money. If you do have them cheap, they are useful for giving to/sharing with friends.
Due to the mass availability of CMC media from various manufactures, it's hard to avoid them. However, I still use my TY Fujis for actual data backup.