At this price, I would have hoped for more from WMF. Also, I seem to have caught a Monday device.
The tinitusartige sound varies depending on the tank and mood. My unit went directly to the WMF Service ->
And came back with the note that you might not understand the whistling described. In particular, I was pleased to hear the reference to scratches and traces: The unit spent 2 days old.
Too bad, because to get brewed a single cup the function I find really great.
The taste convinced!