The thermostat of the kettle is reliable - the temperature displayed is correct. These things I have tested with a penetration thermometer, which shows exactly the same temperature me. This is an important asset for a kettle in which you can heat the water up to a certain temperature, ever.
Some complain about here, that the kettle heats up the water too much - ie higher than the temperature that you have set. That's right - and it can be done not help. Just think about how the kettle works. It is turned on, the heater is hot, heated to the bottom plate. On reaching the desired water temperature, the heater shuts off. This does not mean that the hot bottom plate cools immediately, but they are of course still some time off heat - just like a conventional stove. The is also not immediately cold after turning off. Even if you heat water in a saucepan, it is warmer than expected if you do not take it right away from the plate and pour out of the pot. Depending on the amount of water, the water is so easy even 5-15 degrees hotter than set before the temperature drops. However, I do not know why specifically in this kettle is a problem, since he after heating continue permanently displays the current water temperature. So you have to just wait until the water has cooled to the desired temperature.
Two large defects, the kettle however in my opinion. The largest is the level indicator, which is located on the rear panel - ie opposite the display. You have to turn the kettle so to see how much water is in it exactly. Right-handed extremely disruptive. And left-handers can indeed see the level, but not the display. What the designers have this thought that only they know. In any case, the level indicator becomes almost totally useless.
The second defect is the plastic stench of Waser Kocher still exudes even after several usages after every cooking process. I'm really not a "green", but even I'm wondering what's probably all lands in the water and afterwards in my body. Finally, the plastic inside is hot every time, and are certainly some delicious chemicals to the water. If I had children or even infants, I would stay away from this kettle, and urgently. And even for me, I've been thinking to bring me a glass.
Another not so serious shortcoming is that the stove is pretty shaky on its pedestal. If it is full, then it wiggles when cooking disturbingly back and forth. He will hardly drop, but this is not great also.
The cover me not going to go far enough. With the old kettle he could be opened up to more than 90 degrees, in this there are more than 70. And so of course I am referring to the angle, not the temperature.
All in all, you get a visually beautiful kettle whose electronics is reliable, but certainly could be a health risk and in the handling is partly cumbersome. Subsequently, I would not suggest the purchase.
