Actually, they eat pretty good. I had a good two dozen or so from our trip in October. I have smoked them in my little $30 Brinkman smoker, and they were great. I have used them in stews, and other sauces, and they are a little tougher than the Canadas, and perhaps a little more 'livery' in taste, but I think that the smoking has been the best way to cook them. Marinate them overnight in a garlic/pepper marinade, and smoke for 2.5 hours in the smoker. I used an applewood chip, along with some oak from the backyard. They were good, and I passed them out to unbelievers at work who thought they were pretty good.
Grilling and other ways of cooking the snow goose have been tried, but moister ways of cooking, also with the Canadas, are preferred in this house. I usually cook the Canada breasts by slicing and sautéing, then adding to some sort of a sauce, over rice or noodles.
Still, good eating, either way.