No, it is great for concrete floors too, because it just picks up just the casings and not all the lead dust and dirt. We use them at USPSA practice, so each person can get their cases back, as many people reload.
The broom method is better for general use where people just sweep the brass into pans and dump them into a bin, which later gets sold for scrap or to ammo re-manufactures, who use cool sorting machines that separates the various sizes into their own bins for reloading.
