Easy, easy, easy. We babysit our granddaughter when our daughter is at work. Like my daughter, I breastfed my own kids and so never had to personally deliver any bottles. I was concerned about messing with boiling water while holding a screaming baby. This system is fast, safe, easy to do one handed and perfectly reliable. I wish it was available without the cooler. We don't need or use that part, but since it's not connected, we just put it away so that it doesn't take up room on the counter.