I often refer the curious to the Health New Zealand test results, and I use them to assure myself that my practice is safe. I certainly think that's the case. But ..
That study and the resulting papers have not been peer-reviewed and published in a scientific journal. Read the FDA statement to suppliers carefully and you'll pick up on that fact. In essence, any group, the Wholey Technofoggers or whoever, could claim to have done a study and put the results on the Web. Errors or outright fraud will come to light only with peer review.
So the fact is that the New Zealand studies don't mean squat -- yet. They have no standing at this time in the scientific community.
And nothing done privately by a supplier will pass muster. That's like a bad used car salesman joke: "Sure, it's safe. Lookee here at my papers."
All these reasons are why you read, and will continue to read, that there are unknowns about e-smoking, that no studies acceptable to the scientific community exist to show safety and efficacy.