Are the parts you have to buy for the hospital-grade Medela pump also compatible with the personal double electrics like PISA, Freestyle, etc? My insurance only gives me a rental pump for six months, which means I also have to buy myself a pump (grrr) and if the accessories are compatible, I think it might sway my decision on what one to get (the other option being a Hygeia -- I've heard good things but it's a lot harder to find parts on the spur of the moment if I were to need them).