When I started bottle feeding my newborns, I was determined to skip Dr. Brown's Natural Flow Glass Baby Bottles because there were so many parts to clean. However, once my child was diagnosed with reflux, I immediately went to the store and purchased these bottles. I chose the glass bottles because I felt that they would be more durable. We saw some instant improvement in the amount of air my child was getting during each feeding. And, overall cleaning the bottles wasn't really an inconvenience. Child's Comfort These bottles did provide some relief to my child when her reflux was the worst. Leak Prevention We never had any leaking issues with these bottles. Ease of Cleaning Cleaning does take a bit more time than some of the more traditional bottles. There are just more pieces. However, everything can go in the dishwasher which is helpful. Keeps Air Out YES! These bottles keep more air out. Durability The glass bottles are very durable. They held up great through two children in an eighteen month period of time.