No flavor change that I have tasted if anything more mild. The problem with these pellet machines is that the fire is always being forged with forced air. This makes them burn clean and efficient but makes it difficult to really taste the fuel. In a stick burner you manage the coal bed to control or maintain temperature, in a pellet machine there really is no coal bed just an active air fed fire, more fuel =hotter temp, less fuel=lower temp but the fire is always air fed and burning clean.
Many years ago I had a Green Mountain grill. I’ve never seen another pellet machine operate the same as that one. It would actively forge the fire until the temp was reached then it would “huff” the air to the fire kind of a bellowed effect with fan kicking on/off until temp dropped below set then steady fan kicked in and more pellets added to the fire. It was excellent, I wish they all operated the same way.