Has anyone used a Baby Brezza formula making machine? Was it worth the cost or more of a hassle to keep clean? It seems like there are really mixed reviews out there. Alternatively, I found an electric kettle that heats to 100 degrees Fahrenheit (so essentially body temperature) and was considering that instead since heating up water and then pouring it into a bottle to mix/shake with the formula powder seems like way less work than keeping the Brezza clean. Has anyone tried using an electric water kettle with an adjustable temp setting as an alternative to pre-mixing the formula and using an old school bottle warmer? I should note that we have an old Born bottle warmer but that thing is sooooo slow to warm up. The added perk of using an electric tea kettle is that it would be usable after the baby outgrows the formula stage.