Luxavius
The impression you gave with your comments was that you really wanted the Das S silent over the Majestouch. At least this was the impression I got. It seemed taht the volume button was very important and was the one feature that was standing out more. I can understand the want for a volume button. I never used the other buttons except the volume button when I had a multimedia and they are the buttons I wish I had on my keyboards.
That being said, I think the general consensus is that people have experienced problems with their Das and the fact that the Das S which was supposed to correct the situation introduced new problems does not help Metadot a lot. To someone looking for a reliable keyboard, this should raise a red flag. The general consensus is also that Filco has a way higher rate of reliability. Like Alpslover said, multimedia buttons become useless if the keyboard is fulfill its primary function.
When it comes to after sales service, I cannot speak for Metadot as I have never bought anything from them and therefore never had to call them. However, I have bought two keyboards from Elitekeyboards. I had an intermittent problem with my a key and Elitekeyboards took care of the problem.
Now, if you want to buy a Das S, it's up to you. Seriously, wanting one product and buying another is not a recipe for happiness because you will always wonder what it would have been like had you stuck with your initial decision.
Good luck in your decision making.