The descaler hällt definitely what he verspricht- the machine run more quietly and the coffee tastes better. Descaling is generally important, however, these are simple citric acid that can be conveniently bought at any drugstore because is not Senseo it, but in both cases it is a simple powder is dissolved in water.
I myself am a friend of original accessories and branded goods, but must confess that there are cheaper alternatives here, which are identical in this case. Why only three stars.