[Bartmaniac]

Just a quick question. Everyday I download the newest build and install it. Maybe that is not necessary? Is it OK to do it every day in and out?

I update pretty much every day. I use Leopold's add-on to update easily.
So there is no problem with doing this.

Is it necessary? Depends why you are using these builds. If you want to help with testing, and see new features as early as possible, then sure, update every day.
If you don't then sticking with a stable build may be better.

I'm using these Mulhouse builds on my rpi2 attached to my Sony LCD en wired ethernet to my router. No dvb devices and no pvr stuf whatsoever