I was torn at first before I bought mine because my setup already worked pretty well as it was. However, I liked the idea of changing from 4 switch boxes to 1, and I liked the idea of being able to send multiple signals to different TVs at the same time if needed.
Here are a few things to keep in mind.
If 12 inputs aren't enough, you can always keep an eye out for a 16 switcher. My unit is 16 inputs and 8 outputs. I currently use all 16 inputs and 4 of the outputs. The only systems that don't run through my switch are my HDMI systems and my RF only systems.
Also, does the unit come with the Phoenix connectors for the audio? Back when I bought mine, I was having a hard time finding a source for replacements. This was important because only about half of the units I saw for sale included these. Since I couldn't find replacements, that figured heavily into which one I bought. Luckily, finding RCA to BNC adapters is pretty easy and cheap.
With that said, don't forget to price our all of the RCA to BNC adapters, along with the cost of whatever you plan to use to run audio through the system. It can add up quickly if you aren't careful.