There's some research on hospital grade pumps, but there's little comparing brand to brand. I reviewed what there is in Selecting and Using Breastfeeding Tools (Hale, 2009), and Marsha Walker did the same in Breastfeeding Management for the Clinician: Using the Evidence (Jones and Bartlett). Much of it is spin, and quite a bit is set up to make the pump look good, so read the original studies, and read them carefully. Do you have a specific question, Pat? Catherine Watson Genna, BS, IBCLC NYC *********************************************** Archives: http://community.lsoft.com/archives/LACTNET.html To reach list owners: [log in to unmask] Mail all list management commands to: [log in to unmask] COMMANDS: 1. To temporarily stop your subscription write in the body of an email: set lactnet nomail 2. To start it again: set lactnet mail 3. To unsubscribe: unsubscribe lactnet 4. To get a comprehensive list of rules and directions: get lactnet welcome