in my opinion should be able to burn any & all pellet brands . They<engineers> should be build with simplicity for user friendliness & effective burning with minimal tinkering. I have deduced that after burning so many bags, things have to be tinkered with such as air,etc. It seems to be just common sense that upkeep of stove cleaning is highly important . I know i'm having my share of problems & they are not related to my chitty pellets . I got to this by reading all the posts & my experience with my stove . Back in March & April ,i burned 3 brands of pellets with no problem , then pre-bought the Athens & started seeing a difference . But i know now that the problems i'm having as we speak has nothing to do with the pellets . Maybe i'm wrong but putting all the posts together about pellets & their "bad" burning , my conclusion is the pellet stoves themselves. They,the stoves, should get hot enough to burn all . My 2cents. Muss