Not so great...
Red heat setting dial is ackward to adjust if your hands are slippery with oil or lotion, the black numbers indicating temp levels rubbed off first time I used it and it melts the bottom of my plastic bottles if bottles are left in warmer over 90 minutes. I've put a piece of cloth in unit to buffer heat element from bottom of bottle and that works somewhat well as long as cloth stays under bottle and doesn't get wadded. Not thrilled.
Rating: 4 stars