I've tried a few bowls, including a copper one lent to me for a few weeks. I've settled on a pottery piece for several personal preferences: sloped sides as opposed to vertical, good heat retention as opposed to plastic, very well formed and comfortable handle, as opposed to palming it, some texture built into the bowl for pressing soap into as opposed to smooth. I've also got into the habit of scooping most of my soaps, so I use it most days.