Experience with the TKA 6024 in red and gray; TKA 6028 in dark-gray & TKA 6621 in black

I have the coffee machine has been going for about 3 years. They prepared good coffee I do not deny. Also, the removable water tank is very convenient! But no dripping coffee on the hotplate, not true! This does not happen only to me but also my husband. So, this can not be due to the awkwardness. ;-) Also I discovered over time that a whitish coating (probably limescale) has set the red edges and grooves which can be eliminated only with vinegar and patience. The question arises whether that comes from water vapor, or if the coffee machine is no longer tight. Moreover, that has the left side of the case between the red and gray joints warped. The next criticism is then that in the lower groove of the red cut filter for the gray filter element collects the water that leaves traces of lime, of course, behind. I dry the tedious with a tea towel, because this can cut filter take out very awkward. One has him a little pull, and simultaneously tilt slightly to be in order to take him out to, but what I have done so far only 3 times, because it can be very difficult to reinsert!
And the last point of criticism: The lid of the glass carafe must be raised with the thumb and one should this not pour too fast, so that the coffee does not run next!
Many Greetings
Sylvia