how can an egg cooker is only as good?

I do not know exactly how this works, but the eggs always succeed. I had the eggs the way I wanted them and never before an egg is me doing become blue or crude remained always accurate. The hammer. Instructions in good German explains the more complicated functions (you can somehow make in a setting that different eggs hard. Eg 3 points and 2 hard or something) understand. I've never used, however.
Lime in the water you get through previous descaling the water pretty well under control.

The only drawback: The measuring cup has markings for each degree of hardness and the number of eggs. But should always be made fully according to instruction. Who makes the thing operated intuitively's mostly wrong (too little water fills a) and thus leaves very unsightly water marks in the tub. So make the measuring cup always full !!!

Tip: One should make no vinegar into the still warm water according to instruction. Accesses namely next to the lime also the metal. I'll do it anyway occasionally (every 5th-10th egg cooking gear), so you get the lime quite well removed. In the water and vinegar mixture then with NEM pot sponge bissl n the lime away scrub and is good =)