Tested with a toothpick after 4-1/2 hours and it went in and came out easily. Removed the ribs, wrapped in tinfoil and towels, then stuck them in a warm 'cooler' for 45 minutes until we were ready to eat. The meat was moist, tender and delicious. It wasn't "fall off the bone" tender but would come away from the bone easily when you nibbled on 'em. Best ribs yet for me and I'd be happy to have all mine come out that way from now on. Kudos for the Memphis Dust rub recipe!