One, they must have been using ancient devices. They are talking about variable voltage settings on the devices. Modern ecigs are set in terms of wattage (they measure resistance and compute the voltage setting). It would be more helpful if they would report on coil temperature directly since that appears to be the actual significant factor. The voltage tells us practically nothing about the actual temperature (that would vary GREATLY based on the coil).
Since most good e-cigs (read, not the ones produced by the tobacco companies or advertised on TV) have temperature control, knowing the temperatures involved would obviously be useful.
Note that while 'cloud chasers' inhale for 5 seconds, others are closer to 3 or less. I observed myself today and found I inhale for about 3 seconds for the first puff (and sometimes the second) after letting it sit for a while and then take a few additional puffs of a bit less than a second each. Sometimes the followup puffs don't reach my lungs at all.
Next, they show that the worst case was 1/4th the level of a cigarette. That certainly sounds safer to me. Nobody I know of has claimed e-cigs to be perfectly safe, just significantly safer than smoking. It is known that many far more potent carcinogens in cigarette smoke are absent from e-cigs.
It would be useful to know the levels emitted by other common activities likely to involve decomposition, such as cooking or exposure to auto exhaust.