Apart from the previous negatives, I discovered that inside the water tank there is a silicone coating which deteriorates over time, resulting in consuming silicone solution with every coffee

Flawed design/materials. 1) It requires a very strong tightening, I added an extra gasket. 2) When the coffee comes out of the spout and you don't have the lid closed (which you should have to control the progress), the coffee splashes out of the container due to clogging. It is very easy to get a burnt taste.

Edit 2022: 6 years later, I tried it again, and a solution is to use LOW HEAT. You need to be very careful when you start hearing the clogging sound, close your eyes. In an electric coffee pot, if necessary, we remove a little from the heat to stop the flow. As soon as the extraction starts, I close my eyes. Essentially, the extraction is done with closed eyes. I don't negate the 1 star because there was indeed an issue with the gasket that was fixed by adding a second supplementary gasket.