I would (and did) register for it. I would call your insurance first to see if they cover it but if not (or they only cover a manual), put it on there to at the very least get the completion discount. I ended up buying my own so I'm glad I had the discount. We also had things like freezer bags and nursing pads on there, and an extra set of parts.
Also, I don't know if hospitals have gotten cheaper but it was in no way cheaper to rent from a hospital than buy my own, unless I was only BFing for 2 months. I don't think there is anything wrong with renting for a month to make sure everything is working out okay with BFing/pumping (which I did) but in the long run, it's cheaper to own one.