We just started getting eggs from our hen.  (Three days ago) Had tried purchased duck eggs before and the were quite large, and had a strong taste.  They do, indeed, get rubbery if you overcooked them.  Our eggs taste better than the store bought chicken eggs.....according to my husband (who I thought would never eat duck eggs, and now doesn't want chicken eggs anymore).  Our eggs didn't seem to have the strong taste that the ones we purchased did previously. Have heard what you feed them has quite an effect on how the eggs taste, so maybe that is why our eggs do not have the strong taste.