Do you not have any kids that use booster chairs or do you just keep them in high chars until they can sit at the kitchen table? I like these for a family to eat at, but honestly I'm not crazy about them for daycare... partly because they aren't accessible for little kids, and I envision kids bouncing on them. As far as the punctures or holes in the seats, they do sell vinyl repair kits for restaurant booths. I have no idea where, but I remember them from many years of work in the restaurant business.
I love a site called discount school supply if you are interested and have the room for kids tables and chars. I have a set that I've used for the last 4 years (as long as I've been doing daycare) and it still looks brand new. It's made to withstand scissors, paint, markers etc... washes clean (they come in different colors and are the kind of table surfaces they use in classrooms. The chairs have had and kids rocking it them, wiggling etc... and I've never had to tighten them or do anything but clean them.
Just my two cents since ya asked... : )