I have one that I picked up on sale .. both of them cost me $45 .. do I really need it .. NO!
But .. it gets briquettes/lump ready to cook in about 10 mins. You can use anything that blows air on the chimney hole like a hair dryer/blower etc and save money .. or even concot your own chimney by adding a vent tube like they did .. for convenience this is hard to beat :-) I do use my BBQ Dragon fan on my other grills too (BGE).