Those are both great systems.
Eisenmann is made in Europe and has been known for quality for many years. We have always loved their systems. Miestershaft produces some great sound. We just installed a Miestershaft on an X6M and were very pleased with the results. For the money it's a steal!
Here's an X6 3.5 video from Miestershaft:
In case the video above doesn't work:
Miestershaft YouTube
Feel free to PM us if you have any questions!