This has been my 5th or 6th smoke on my new 18.5in WSM. Yesterday I smoked 9 baby back rib racks (from Costco) - 5 on the top grate and 4 on the bottom grate. I am so impressed.
First, the ribs were done after 5 hours. Second, I was able to do all my other pre-party chores (lawn mow, ice...