Since my old egg cooker crumbled the inner workings, I needed a new one. Due to the good price and the good reviews I bought the Severin. After a few eggs cooking sessions, I had the right amount of water for my favorite hardness out quickly, it may be eggs cook with reproduizierbarer hardness. But that was my old Siemens also.
What I do not find so successful: The handles of the lid and especially from Eierhalter be quite hot, as you can easily burn your hands, that was much better with my old. The inner workings of plastic makes a not so high-quality impression, from the feeling, I would say that it has been slightly deformed.