I'm NC 20, and I can't wait for this collection!!! I would totally get a l/s if I were a true porcelain beauty, but unfortunately I have ruddiness that doesn't compliment the gothy romantic look. However, I will totally get a gloss. I'm not sure how close to YSL's black gloss they are, but someone posted an awesome pic of herself wearing that gloss over a red l/s, and it looked really amazing.
The SA at Nordstroms was really excited for the grease paints. She said they were developed by one of the master artists who covers the Orange County region (can't remember his name). They sound like they're worth a try.