Answer:
Advantages: more knowledge about how exactly DNA works and what each codon expresses in an organism. we don't actually know what most of the DNA does. Essentially the advancement itself of being able to clone an organism is the advantage.
Disadvantage: the cloned organism always has a problem that scientists cant figure out. for example the cloned cat Cici at Texas A&M University has seizures and they dont know why (this university is very advanced when it comes to biology). Naturally also there is the fact that the clone is identical to the "parent" so if people started to be cloned then fingerprint or DNA recognition would not be possible. there would be two or more people with the exact same genetics.