Cuts taken too far along in flowering, can be harder to get to root, they definately take longer, then they have to revert to vegging, which is also time consuming.
But if taken within the first week or two of flowering, I've had good success.
I take cuts at the same time that I up pot a week or two prior to flowering. I then make certain that I have established clones from each plant marked as such, before I flower out the plants from seed. After smoke testing, I can then choose th pheno of my likeing as a "Donor" plant.