I've been using this bottle warmer for 3 months and I can definitely say I love it. With my first child, I had a more expensive bottle warmer and I wasn't a fan. It had a little turn-dial on it and the temp was never consistent. This one makes it easy. On the back on the unit there is a little measuring tube and the tube is marked with numbers 1-10. I have no idea what unit of measurement these correspond to - maybe just randomly chosen by the manufacturer? The booklet that comes with the unit tells you what to fill to according to how full your bottle is and you can change that up depending on how warm baby likes their bottle. I'm heating 5-6 ounces that comes straight from the fridge, so I use a "10" every time. It makes the milk what I'd call room temperature in my 9oz Avent bottles. Dump the water in, put the bottle in, hit the button. No more thought needed than that! A blue light comes on around the button and will go off on it's own once all the water has been steamed out. Some people complain that there isn't a ding or something when the warming is complete. I'm fine with that. I don't need another noise at 3 am when I'm doing my best to keep quiet and I don't need a ding to alert my baby milk's coming like Pavlov's dog. In the amount of time it takes to change a diaper, apply cream and properly wash your hands - the bottle will be ready. Wipe the bottle off (heating water causes steam, so the bottle will be wet, duh). I swirl the milk around in the bottle to just make sure there aren't hot spots. Easy peasy.