Ivy:

When I went to replace the bristle brush on vacuum head, I also was looking at the rollerhead type. It was labeled as "for concrete pools."

I asked the pool guy (insert derisive comment here) if I could use it on my vinyl pool. He said the wheels would be too hard on the surface. I went with that info and bought a triangular-shaped head with bristles on the bottom.

Then again, I get the kids to brush and vacuum when I'm too lazy ... I don't notice problems with fighting against suction at ALL.