Are you serious? There are SO many pros for human cloning (i'm assuming you mean human CELL cloning)
1. Ability to keep cell lines from patients with rare diseases so we can study the molecular basis for the disease over a long period of time, perhaps even after the donor patient's death
2. Ability to study in detail the cellular process of differentiation, development, and growth
3. And if we have the ability to do (2), then we will understand cancers a lot better, since cancer is just inappropriate de-differentiation and proliferation of cells.
4. And if we understand (3), then we can work on cures for various types of cancer, and find out preventative treatments
...And so many more that i can't ever hope to compile an exhaustive list.
Human cloning, as in cloning a PERSON in their entirety, has pros as well. We would understand better how much contribution your genes make vs. your environment, how personalities are shaped, etc.
BUT that comes with major major moral concerns, and before we can really do that, we need to be able to address what makes you YOU, and what sort of status these cloned persons would have, etc.
there is nothing positive about playing with the work of the good lord! hes our creator not human! watch yourselves!