There was a news story here about a guy who had cancer and got treated with DCA in Canada which rapidly decreased the size of his tumour. Doctors in this country can't and won't treat people with it unless they're willing to break the law. As for efficiency, I believe the reason it can't be said to have demonstrated improved survival is that there has not been enough large scale clinical trials to test it as a drug for cancer yet. Hence, a lot of the evidence for its effectiveness will be anecdotal or come from animal experiments.
As for the side effects, they are supposedly quite trivial. There are negative side effects if dosages are too large, but that goes for any drug - or even clear, clean water for that matter. At a certain dosage, just about anything can be toxic.
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