Is that the sponge with the rubber side for overspray removal/clay-bar type usage? If it is, it's wonderful, we use it every day. It's very aggressive, and looks like it almost sands the top of the orange peel of the paint a little, but if you're polishing the vehicle anyways, it's great. Very very fast to use.
It is a replacement for the clay bar. BUT. If you are only doing a clay and wax, I would use the claybar. The sponge is VERY aggressive, and will scratch a little, so car must be polished afterwards.