Anyone using the Mr. Heater "Journey" catalytic heaters?

I have a hard time believing how may people are actualy using these, there is a reason they were banned from being instaleld in new rv's in the lait 70's or early 80's cant remember exactly when now at my advanced age haha. people were dying from them. yes some people are responcable and crac a windo and a vent, this also sets up a natural convection (or it wouldnt carry any unintentional byproducts of combustion out of the unit.) you would be surprised how much heat loss this convection can cause. plus the fact that inbetween the open windo and the heater will be much colder than the rest of the camper.