My opinion is to not waste your money on a Smokenator................especially given you already have two other smokers. Get you a couple of firebricks (or regular bricks), foil them and don't look back. Bank a load of unlit coals on one side of the kettle behind the firebrick.......leave enough space on one end to dump 15-20 lit coals, drop your favorite wood chunks in (one on the lit coals, one on the backend of the unlit) and you're set to go.
A drip pan under whatever cut of meat you're smoking will both help keep the kettle clean and help regulate airflow for more predictable temperatures. I've gotten 13+ hrs from this method with no vent fiddling, no adding coals, nothing. Even though I have two kamados, including a very nice large Big Green Egg, my Performer is easily the most versatile and most used grill I have.