It am absolutely in love with this Stellar egg-bolier! It is completely reliable and makes perfect eggs every time.
You can choose soft, medium and hard eggs and this is determined by the amount of water you pour in via a measuring cup (included). The eggs are always cooked exactly right every time.
When the cooking's finished, a good loud buzzer starts up which you can even hear outside so that you go and immediately turn it off.
I just love using it. You can cook up to seven eggs at one time or just one or two, whatever you like. I boil a few up because I like medium boiled eggs in my salads.