Am researching pumps before baby is born. Medela has a new "advanced" version of the Pump In Style. It is pricey--about $315. Has anyone tried it?

Also, don't understand what difference is b/w "hospital grade" and the grade the PIS is. Is that an issue relating to how many kids you can use it for, or does it relate to how fast it pumps?

I wanted to buy a pump now as we are having baby #1 and am hoping we'll have a baby #2 to use it for, too, so it seems more cost effective to buy than rent.