Yeah, matrix switches always seem like a cool idea until you get into the details. The single biggest problem is HDMI is a handshaking protocol. ALL of your display devices connected to the matrix must communicate with the source devices in order to determine the correct video and audio quality (along with HDCP copy protection). This is fine if EVERY SINGLE DISPLAY IS EXACTLY THE SAME. For a place like a bar or other commercial establishment that's not likely to be a problem. But for a residential setting it makes for headaches.
The problem boils down to the source devices have to deliver a signal that the 'least capable' device can handle. This means that 720p 20" TV in a guest room with just stereo speakers will force the source to use low res, left/right stereo only. This means the 4k projector and Dolby Atmos-capable AVR in the theater won't get the higher-quality source material that the sources might be capable of providing. This leads to host of possible work-arounds including using various HDMI dongles, EDID hacks and assorted converters. Trouble is most of them don't work as effectively as you actually need (or think they should).
It ends up being a lot less trouble to just use a small network streaming box behind each TV. This way you only have to run regular Ethernet to it and can handle controlling it locally with a regular remote. Then you're just pulling media from sources in a digital format and the streaming device handles transcoding it accordingly.
Now, if you know about the handshaking limitations going in, and you're prepared to not try to share all sources with all displays then you might be able to use a matrix switch. As in, anything with better quality gets it's own sources. No one cable box shared between the theater and the bedroom, for example.
The difficulty is you run afoul of the WAF (wife acceptance factor). All too often the spouses don't want to understand why all these gizmos have these limitations and you look like an idiot for trying to make her jump through these hoops. Whereas 'one box in each room', that they get.
Edited by wkearney99, 08 January 2016 - 09:17 AM.