I use CR with belle regularly as part of her self-control training, and also to help her learn to beg properly. I don't often use it as punishment, but sometimes as part of a larger punishment. She's almost to the point now where she cannot cum without permission. On her own, she can't at all, it's mostly during sex or play with me that she has trouble holding back.

A good combination is forced orgasm after CR. Or mixing the two. I often like to let her cum six or seven times, and then have her stop and try to hold back for a while. Only once has that actually made her cry, but I'm hopeful it will happen again at some point.