I tried Medela electronic mini pump given by a friend when I gave birth to my first child. I did not feel comfortable with it and the most important reason for not using it afterwards was it created sound which I thought was not good to my baby if I pump while feed. I switched to Avent manual pump then. For my second child, I now use two Avent manual pumps for pumping milk in office, and it proves to be more efficient than using only one. You can try to get an Avent manual pump for pumping at home while feeding, and use it with the Medela one when pumping at work. It costs less than $300, but may ease your problem.