Langs are a very popular and well made smoker. The reverse flow design helps reduce hot/cold spots by heating a full length baffle under the grates.
Also have a Klose (traditional) smoker which has various hot/cold zones which can be advantageous cooking multiple temp zones off one heat source.
Cooking at Mason-Dixon BBQ Services
Lang 84 Deluxe Kitchen known as "The Glamazon" , Custom Klose Backyard Chef... of Snot, and a 22.5 WSM
Lang 60 Mobile - The Damsel II, Lang 48 Patio - The Damsel, Bubba Keg Grill - RIP, Double Barrel Smoker and a BSKD