Just got a hand me down WSM from my good ole grandpa (an original C model nonetheless), and love it. I've been doing occasional comps using my pellet smoker but wanted to try charcoal/wood for better bark on my pork/brisket. I do notice a variance in fuel usage in cold/rainy weather, my question is does anyone use the insulation covers sold by bbq guru? If so, do they work, are they worth the money? I have a guru so I'm not worried about temp swings, I'm just trying to figure out if it will save me enough on fuel in the long run to cover the cost. Thanks