I use the Neet HDMI Matrix to switch 4 sources between two displays, and it works perfectly. I had a problem with previous auto-switching devices that were triggered by a PVR waking to record, so went for this manual/remote device instead. I have a TV and projector in the same room so don't use the full matrix feature as such, but know it works.
The remote control is very simple and easy to add to my Harmony One multi-remote. The matrix handles my 1080p @ 60Hz signals without a glitch, and everything up to that.
Sometimes some of my devices take a while to warm up, so the switch needs to be told again to use a source, as it seems to go back to sleep if a chosen source is off when it selects it. Just allow for this with a delay in your multi-remote settings.
Neet have been very helpful when contacted about their products, so I felt secure ordering from them again.