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The YS1500 is the closest thing as far as a pellet grill is concerned to a true stick burning offset smoker in how it cooks and results, most PG's you need to cook low and slow to get a decent smoke profile or add smoke tubes/trays or Mojo Bricks , with the YS1500 you can let it roll at 275 if you want to. If cost isn't an issue and you can use the the capacity the YS1500 it's a no brainer, I've have talked to few people who started with the YS640 and then upgraded to the YS1500 and none of them have regretted buying the YS1500.