Should we clone humans?

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I see nothing wrong with cloning humans. However when it comes to the utility of cloned humans, I have some issues. While there are probably few people more gung-ho for DNA manipulation, genetic engineering, biotechnology and such, I have ethical objections in regards to using a cloned human for such purposes against its will just as I do for any human against its will. Though, I love the idea of cloning parts of a human so they may be used as "spare parts" when other organs or parts fail or are lost. If a human were cloned, but placed in a vegetative state with no mental capacities, then I would also have no objections. What do you think?