We now have four weeks of experience with the device and use it at the time only to keep warm tea because my wife still breastfeeds. There is nothing to complain about for this purpose on the unit. We appreciate the infinitely variable temperature settings and have found our optimum for 2.Setting before the vial. If we take the bottle we select a correspondingly higher setting so that it stays warm longer. The device runs almost around the clock, so any time we have warm tea to picformat (eg hiccups or colic). Of course it is only on automatically when the temperature drops below the set value. Therefore, there is one of us a perfect score ..'m curious if it really takes in glass as long as reported below.