I bought the vaporizer because I had enough of it after a few days, always boil my bottle. This took forever and you constantly burned his fins.
The device can be filled with five bottles. I have bottles of NUK, Avent and MAM and they fit all three purely easily. Only the suction of Avent are slightly larger and have to be purely set wrong (they do not just lie in a basket), to make them fit. But I can live with. Bottom of the unit is a plate that is hot. Here the water then sterilized the other things evaporates. A lid ensures that the steam actually envelops everything and does not disappear in the middle of nowhere. A small hole in the lid is because the pressure reduction.
The nice thing about the device is that you can just fill it and turn. It then heats by itself, until all the water evaporates and then switches itself off. Will you still advance to the content, you can turn off the power again. My only drawback: The cable is very short. This has probably security reasons, but my sockets in the kitchen are all under cabinets and that means that the vaporizer always evaporated in the upper cabinets. Which are thereby damp that is ugly.