Though I don't think I would ever try to clone a pet, I did have a cat when I was in elementary school that I would love to have back. For two and half years, that kitty was my best friend (ages 6 and up) until our animal hating neighbors ran him over. He followed a foot and a half behind me everywhere I went, and if I went indoors, he sat in the window waiting for me to come back. He meowed in response to me when I spoke to him. Best cat ever.
If I could have that cat back -- I'd consider cloning. However, this particular cat was "special" because he got imprinted on me -- he was taken away from his mother too young, and attached to me. So even a genetic duplicate wouldn't produce the same loving behavior, now, would it?
