Cons: Well, it is a breast pump. Bleh.
I bought a PISA prior to returning to work with both kids. I pumped so often and for so long with my first (18m) I thought I should save it for home use, even through the pressure was fine when I checked it. It was handy to have a pump at home with no schlepping back and forth. I used the second one until she was 2.
Medela's website has several full time lactaction consultants that answer questions by email. They offered very good advice and even some humor.