I've been using this warmer since my son was ~4 months old. When used as directed, it overheated the milk WAY beyond the recommended limit of 104 F. I just did a test with a 6-oz bottle of ice-cold water and it heated it to a whopping 126 F(!). I'm reluctantly giving 2 stars because it worked well enough once I started only using the 1oz or 2oz setting regardless of bottle size, but only after accidentally overheating countless bottles when using the "correct" setting.
It's been a number of months since I first became aware of this issue (I'm just now writing the review because motherhood) so I tested it again. I filled a Dr. Brown's narrow-neck glass 8-oz bottle with 6 oz of water, chilled with ice to 44 F. I set the warmer to the 6-oz setting and filled it all the way to the top with water because the "milk" (water) in the bottle was above the top of the warmer, then turned it on. At one point during the heating process, the water was actually starting to boil so I knew this wasn't going to go well. As soon as the light stopped blinking, I immediately removed the bottle and measured the temperature. As mentioned above, the water inside the bottle measured 126 F -- 22 degrees above the level at which nutrients supposedly start to break down. I don't know if water and milk heat differently, but I do know this is consistent with the experience I had with milk.
I'm beyond upset about the number of times I may have destroyed nutrients in the breastmilk I worked so hard for. What makes it extra disappointing is that I specifically sprang for this model because it claimed to have a temperature sensor and I really wanted to avoid overheating the milk. If I could do it over again, I would save my money and buy a cheaper model and just test carefully the first few times I used it.
I've attached photos showing the bottle contents and temperature before and after. I would expect much better from the brand and price point.
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