I received the cases on Thursday and directly changed from Mudita original case to the Nakedcellphone carbon fiber design case. For me it feels so much better. It is made of some silicone-compound that feels like hard plastic and is much less attracted by dust. But it is still a flexibel material that will have some shock absorbing effect.
Cutouts are all done precisely and I really like the design of the volume control element. The case works really well with original Mudita screen protector, there is still a gap of around 1 mm, so no issue here.
Although this case slides so much easier in your pocket, it adds some size in all dimensions compared to the original one.
Mudita case
l x w x h: 130 mm x 71 mm x 15 mm
Nakedcellphone case:
l x w x h: 133 mm x 76 mm x 17 mm
I don’t have any Magsafe equipment for testing, so cannot tell you if this works or not. But I will stay with this case anyway, as it is just a level up for the phone. Now I only need better software and then I am almost happy with the Kompakt. 
As mentioned, I now have three Nakedcellphone cases for sale. Two with wood design and one with carbon fiber design. As I needed to pay shipping, taxes and customs for import from USA, I will have to ask for 30 Euro for shipping in Germany or 35 Euro for shipping in EU.
