I have Welsh Harlequins, and had never tasted a duck egg before mine started laying earlier this year. But now, my whole family is totally hooked on duck eggs and will never go back to the dark side!! My girls swim in a kiddie pool and eat Purina chicken feed mixed with some whole oats and black oil sunflower seeds. So, they don't eat fish which means no yucky fishy eggs. I give them free choice oyster shell instead of feeding a layer feed, which would be very bad for my drake.
I eat the duck eggs fried all the time - the secret is to cook them over a much lower temp than chicken eggs. That way they are tender and delicious. The flavor is much richer than a chicken's egg, even the free-range chicken eggs our neighbors used to give us. Since they are so large, if I boil them I put them in water to cover them by about an inch, then put on the fire. Once the water starts to boil I cover the pot and remove it from the heat. I set the timer for 15 minutes, and when it goes off I drain the eggs and then put them in ice water. This makes it easier to peel them. When I boil chicken eggs, I only let them sit in the hot water for 10 minutes. FYI - using older eggs for boiling makes them peel much easier (whether chicken eggs or duck eggs). For baking, there is no comparison to duck eggs. Cakes made with them taste so much richer and better.
And, duck eggs are more nutritious than chicken eggs. Why does anybody eat chicken eggs, I wonder?