The vacuum cleaner is okay.
The outlet problem of bottles is annoying. My child is teilgestillt, so I have to prepare the vials and then keep warm in a double boiler, thus following the nursing process I can just give the bottle to my still hungry child. The milk runs here from the vial from the water bath.
The mixing of the milk in the bottle is not quite as comfortable through the vent valve in the base and as the ground thus not flat.
The contents scale begins at 60 ml - which often is when cooking smaller amounts Drinking too little to find the right mix ratio of hot and cold water.
The lid on the bottle sits on top bomb-proof and is not at all to open with one hand. You need both hands for it - impossible if you just holds with the other hand the baby.
The ventilation works quite well. However, I have now found a bottle with a much better ventilation (Medela Calma that are unbeatable in the vent).
The bottle design is nice, the wide neck for better filling is practical. The many individual components are simple to clean, but take a lot of space in a vaporizer.