The DVR unit died shortly after the measly 12 month warranty period expired. I tried contacting Uniden to source a replacement unit, which I was grudgingly willing to pay for since I had already installed the cameras, but they don't sell them individually. They suggested that I buy a complete new system!
As for the product itself, before its premature death, it was difficult to operate, with a very clunky user interface.
In short, both the product and the aftermarket service are rubbish.