I actually had purchased two other Security Surveillance Systems before I bought my REVO system. Big mistake, the other two systems did not work as described. Thank goodness I was able to get my money back, however I still lost a lot of time with each system, calls to Tech support, trying this and trying that and finally having to ship them both back and wait for my refund. With my REVO system it was so super easy to install, the system did exactly as advertised and I am happy to report that after almost 1.5 years of non-stop operation it is still working like a charm. I've never had to call Tech support and I also want to mention that I didn't have to be concerned with a power source to each camera since the REVO system is designed with the one RJ12 cable which is as easy as plugging in a phone. The one cable has it all, Audio, Video and power. The camera's provide a very clear sharp imagine and I am so happy with my system.