The warming function and also the different heat levels are really an interesting idea. I have so far not seen. You can choose between 80, 90, 95 and 100 degrees and has to select the desired temperature to maintain a "Keep Warm" button. At first glance, this option seemed to me basically just a waste of energy. Water remains in a well-insulated kettle also was alone for a while. But if you have really forgotten times, to brew the tea, then already annoys you when you have to re-set up. On the other hand .... I need first anyway only half, I do not need the water and keep warm broth and after an hour scratch. It's a nice "gimmick", it is more for me not more. Unlike the various temperatures. Because I see the sense also save energy. Since I often use the 80 degrees.
Some reviewers have critically evaluated here, the warm-up time. All I can basically say anything because I have set myself no time frame as to when the water must boil at the latest. Generally, I turn the stove anyway, before I prepare the tea pot and when I'm done, the water is ready. Good enough for me. Really long duration does not appear to me also.
To design is to say: Schick :) Good stainless steel, well you have to like and even brushing occasionally ... but therefore it is also elegant and inconspicuously :) You can set the Brühkörper anywhere on the top and also the cable is long enough. I am therefore really pleased - but still looking to keep warm the proper sense :)