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

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