I had originally purchased the Evenflo pump and was disappointed because it kept breaking and then the motor started to go after only 2 1/2 months, so I brought it back and decided to try this pump instead. I put it all together and my first reaction was OUCH !!! The automatic suction/release is a great idea but this also has small bumps in the shield that hurt when using it. I also kept losing suction with the shield being so flexible it kept bending at the neck. Needless to say, it took me 3 days to pump one 4oz. bottle, so I will be returning this product.