Therapeutic cloning (i.e. harvesting stem cells for research, tissue, and organ growth) = Yes, good idea.
Reproductive cloning (i.e. implanting a cloned embryo with the goal of producing an entire human being) = No, bad idea.
Honestly, we are putting the cart before the horse here. The issue of whether reproductive cloning will ever be a good idea is definitely something to consider, but the real question is whether it is a good idea right now. IMHO, there is no way in hell that we should be conducting human cloning experiments (because that's what it amounts to...experiments) given our current level of knowledge on the topic. Cloning humans now, when most, if not all, trials on simpler organisms have failed would be a gross ethical violation.
Every time we run a new cloning experiment novel complications arise. Cloned animals display elevated risks for circulatory and respiratory disease, obesity, deformities...and that's just the beginning. One of my favorite examples is Gurdon's frog cloning experiments (via nuclear transfer) that produced beautiful tadpoles...but guess what? They never matured into adults...remaining instead as tadpoles for their entire existence. Granted, that was decades ago and our knowledge has improved somewhat, and we are using a different technique now, but the fact that we still don't know why that happened perfectly illustrates how little we do know about cloning. What would happen if human clones never underwent puberty? That would be appalling.
Even the world-renowned Dolly was the result of 276 failed attempts at sheep cloning...and now this "successful" clone has developed several health problems, and for an unrelated reason will probably experience a miserably shortened lifespan (1/3-1/2 normal). Will the first human clones begin dying off in their late twenties? Or will they survive only to suffer numerous diseases and defects through middle age?
Frankly, the concept of cloning humans at this stage is so unethical that I find it unbelievable we are even considering it. Patience is a virtue; there is no dire need to rush into reproductive cloning without *many* more years of animal research. Scientists like Antorini and Zavos represent the worst of the field IMO...they are essentially fame-starved madmen. They seek only to write their names in the history books as the pioneers of human cloning, regardless of the inevitable consequences for the clones (human guinea pigs) themselves, or the mothers for that matter. I would liken what they are doing to injecting fetuses with a cocktail of experimental drugs that have previously been tested on animals and found to cause dangerous health problems and developmental defects in the test subjects. These men KNOW this experiment will fail but care nothing for the welfare of the test subjects, except insofar as it advances their own careers. I can only hope that they are ostracized from the scientific community (already in progress) and brought up on charges for their misconduct (unlikely...unfortunately).