The bottle is especially designed for babies who need to switch between the breast and the milk bottle back and forth, without this leading to nipple confusion. I think that's the producer well done. The vacuum cleaner is very soft and therefore correspondingly flexible. The baby can be so shape it, as it usually is drinking at the breast.
The vacuum cleaner also has an AVS-valve which prevents swallowing air, which can lead to colic.
Cleaning is easy, as with other milk bottles also, only that one here has the advantage that the bottle has a pretty big hole and you thereby good comes in to clean with a brush or towel.
Conclusion:
I am very pleased with this bottle, although I try to keep their use to a minimum.