I have a metal Vortex bowl from Saharasmoke and I bought it right when I started smoking, so I was dumb, should have gotten a non-metal one because the one I have conducts the heat WAY to much. I use one coal, 2 layers of foil, and it burns my damn tobacco so fast. If I had to guesstimate, one coal will burn the entire bowl in less than 20 minutes. I've gotten so frustrated I am just using a regular Mya bowl now. Anyone else have this problem? Most are probably smart enough to stay away from the metal bowl though.