So, the only problem , but it's a big problem I have with the reverse flow design is the amount of drippings I get built up on the reverse flow plate/ drip pan. Running the smokers at max capacity 12+ hours a day , 6 days a week builds up 1 inch thick big chuncks of burnt up nasty crap . It slowly starts to effect the efficiency of the cooker and also starts to put off a burnt grease like smell. Rinsing the smoker every night is not effective, the only way is to pull out grids and start scrapping away at the crap, and the big chuncks keep plugging up the drain pipe. Even running water in the pan does not help.