I am a big fan of all your books. I am currently reading Toddler 411 (I have a 14-month-old girl at home). I wanted to share some hints about the Pump In Style Advance (PISA)....
I loved my PISA and used it often, both at home and when I returned to work, but the pump parts were challenging to clean. As far as I know, Medela does not offer a compatible brush/cleaner set that would make cleaning the shield, connector, and accessories easier. Regular bottles brushes did not work. So, one day, I decided to use the nipple brush that is part of the Born Free Twister Brush set. This is the smaller brush designed to clean bottle nipples. It works to clean the pump parts! It fits perfectly and easily cleans the shield, connector, valve and little white accessory...I love it! I found that if I only use it to clean pump parts, the brush can last for several months. It is slightly expensive but worth the investment to properly clean pump parts.
Please feel free to pass this information along. I hope it is helpful! All the best (and thanks for the wonderful books!),