I have to say I would be in the category of those who woudn't even try it. It's not the thought of what it has in it, what's it's stuffed in, or anything of that nature.
I cannot, and I mean absolutely cannot, eat liver or heart. It's the taste. It tastes like I'm trying to eat a piece of metal, so much so that it makes my teeth hurt. I have tried time after time, cooked every way imaginable, because the smell while cooking is wonderful. But the moment I get the first taste my stomach goes to DEFCON 1 and it's all over.
I have never found anything else that affects me this way and I am not a picky eater. Escargot, squid, octopus...you name it I can eat it but haggis I'm afraid will have to stay one of those dishes that I would politely have to decline.