Linens...worth it?

Let me begin saying I know nothing about linens. lol. I am looking into renting some floor length overlays to go over the ivory tablecloths at our venue. I have contacted a couple of local vendors, but while I wait to hear back I figured I would ask for WW experiences. If you rented overlays or tablecloths did it make a big difference in the room? Was it worth it, and if so was it expensive/inexpensive? I am just looking to get an idea of what to expect price wise, a lot of these companies prefer you come into their showroom before they will offer up pricing. Thanks!