I kept my Freestyle from DS1 and am using it for DS2. My insurance doesn't cover them, and they are too expensive to buy a new one for each baby when IMO it is still fine. I had to buy new parts, but that was only $20.
I have a Pisa that I used for 6 months. Then loaned to a close friend who used for a year. Then it sat it my attic for about 3. I bought new tubing this time. I'm done having kids so I will probably just pass along after I'm done. $250 well spent!
I'm keeping mine! I'll probably still get a new one for the next LO if it's covered by insurance, and then I'll leave the new one at the office and keep the old one at home for home use.
Re: Breast pumps post breastfeeding