We travel upstate mountains in TN every-other-year or so to visit the area and stopping at Huck Finn's is a must. I'm a native Mississippian where most of the farm-raised catfish grown in the USA comes from, and can proudly back its quality and taste as long as it is fresh-frozen at the processing plants (which I have toured) prior to delivery to food stores (e.g., Sam's - Delta Pride Catfish Filets in the freezer section) or restaurants.
Huck Finn's claims to serve only pond-raised, grain fed, Mississippi Catfish that is certified by the U.S. Catfish Institute. Based on their website, they serve 50 tons of boneless fillets annually. From many years of visiting catfish restaurants in MS, I can attest to the authenticity of Huck Finn's product source - there's just none better!
The atmosphere is extremely comfortable here, but if you were not raised in the South where growing up with home-based fish-fries (particularly catfish) were a regular big treat, you may not understand. Too bad.
This trip was exceptionally good - the best. We were seated near the kitchen doors which might have contributed to very quick service (plus, the best waitress ever!). Ordering all-you-can-eat, as usual, the waitress checked on me at exactly the time I was munching down the last hot filet of each delivery, asking if I wanted more. By the time I finished the last piece, another plate of hot filets would arrive at the table. My wife ordered four filets, and ate more of the delicious navy beans, cole slaw, hush puppies, and garnishes (onion and pickles) than I did.
If you can find a parking space in the lot behind this restaurant, don't hesitate to take it. Every time we've been here, it is packed. Just remember to ignore the folks out on the front porch trying to sell travel deals - they aren't part of the restaurant but seemingly have resided there for years, as they do at other popular eating establishments.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.