I can't really tell the difference in duck verses chicken eggs. I was always sort of "grossed out" by the thought of eating duck eggs (for no good reason, lol). We ate chicken and quail eggs though.
After living in Thailand for a time, I found out that we had been eating duck eggs for weeks and I didn't even realize it. I noticed that the whites seemed a little thicker, but just thought it was how the eggs were prepared. Taste wise- I can't tell any difference and am now no longer "grossed out" by eating them.