For cons, I find it cumbersome, it must be installed away from the wave devices (television, internet box ...) and some distance behind and to the sides. Suffice to say that unless you have a lot of space in your home, to find a place that is not obvious.
Another negative point, it is very beautiful and therefore attracts children. My son takes him for a walker and will rely on it to see all the lights on, so he did it himself fell on = wire dipping into the ground water reservoir that had spilled. It would take a child safety block so that they can not change the programs.
Finally the price, it's still very expensive!
Still, it is very reassuring to know that his air is purified through the device because with all the low-end furniture we buy these days, our interiors are increasingly polluted.