I've been to Insadong a few times and I've never been disappointed. The meat offerings are quite fatty (not my thing), but the taste is so good that I can bring myself to deal with it. The buckwheat (kasha) tea is my favourite part of every meal - so good. I've had the all-you-can-eat deal a couple of times and it's always good, but it's not the best value if you don't eat much. Though I've heard some people have had bad experiences with the service, I've always been impressed by the speed and quality. In my experience, AYCE dishes have been served within 5-10 minutes of ordering (sometimes within about 2 minutes!) and the servers come around quite often even when you're hidden away in a booth.