As there is nothing else on the market it works. Less carryover from bottle to bottle is good for many reasons, but there are things that could be better. Printing is a joke. I've had milk spills a few times when I go to the kitchen to close the lid or when it fills up and the milk squirts out a bit. The rubber o-ring on the inside falls out very easily and doesn't seem to have a track for it to go in like other adapters I've seen that would hold it securely in place. I ordered a second set because they are so comfortable but they have the same issues so I think it's a design flaw. I wish there was another brand to try.
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