An AMNPS burns pellets or sawdust. I use only pellets in mine, because I also have an AMNS that burns sawdust perfectly. Some people can get the smoke they want from their MES, however it is humanly impossible to get up to 11 hours of perfect, constant, consistent smoke from an MES. An AMNPS can do that. With an MES you'll get at best a cycling of Too much smoke, Good smoke, and Not enough smoke. It's not a fault with MES, it's just the nature of the beast. No electric smoker can produce continuous smoke as perfectly as the AMNPS, without touching it once lit properly.