Me. I do not candle. I have, but I find that hatching goes much better for me if I am only disappointed once. I even "loaned" my OvaScope to HHandbasket and Farmer Lew. THEY candle eggs and needed something better to see through darker egg shells.
...edited to add: "going better" does not mean I have better hatch rates, just that I don't get bummed by early quitters or other eggs which don't hatch. I have always believed that if even ONE chick hatches, it's a good hatch. If two or more hatch, then it's a WONDERFUL hatch!