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I have one, mother in law needs ta mod it fer my stack, so haven't used it yet. Been bout 5 months without, smoker don't look no worse fer wear yet. I'll use the cover when it's done. More personal choice then anythin I think.
I've used the Brinkmann cover on my SNPP since I got it 14 years ago. With using the cover and an annual coat of high temp stove paint, it's still lookin good. I also bought the firebox liner to help prevent burnout. My firebox is still solid. I do not leave the firebox full of ashes and I think this helps to extend the life as well.
BorderBrewer
I've never used a cover on any of my webers. Even though they'll sell you one, the company says they are not good because they trap moisture and accelerate rust...