This is my first run using Cowboy brand lump charcoal. Today I'm smoking a brisket and a butt. I was planning for a long smoke so I was thrilled when I was able to run as long as I did without a fuel reload. Filled the 18.5" WSM with about 18 lbs out of a 20 lb bag. The ring was packed but I was still able to hollow out a small section in the middle of the ring to do a Minion Method. I fired up a full chimney of Cowboy and dumped it in the middle. I added oak wood chucks throughout the day. I had the WSM built and the meat on at 9:45 am. At 6:30pm the brisket was at 170* and ready for foil. At 8:45 the butt hit 165* and was ready for foil too. Almost to the minute, then the temps started to slowly fall off. All day long the WSM held damned near perfect between 220* and 230* with almost zero tweaking to the vents. Just for the math challenged, that's 11 hours without touching the smoker. Now reloaded, and holding steady again at 225* waiting for final temps. Very happy smoker here. Will be using Cowboy again in the future. I found it at my local Home Depot.