Originally Posted by bluetv
The Monoprice rep evens says that the single Cat 6 units are actually better than the dual cat 6 units. It does not make sense to me.
The single cat5e HDMI extenders are mostly based on the HDBaseT technology now (there are a few that aren't, but won't be as feature-rich, either). The dual-cable solutions are less-sophisticated signal extenders, which need both wires to have enough signals to extend all wires in the HDMI cable. HDBaseT works differently, by serializing the HDMI signals at higher speeds, and they add in other features - RS232, 100Mb Ethernet and IR repeating as well.
So yes, the single-cable HDBaseT solutions are actually superior to all the rest, but are not the cheapest solutions. However, if your'e running wire, you should run multiple category wires to display locations, so you have options and have wire in place for future use.
And as SAM64 said, there's no redundancy in any of these solutions. The two-cable extenders need both to operate, period.